diff --git a/README.md b/README.md
index a1b5f52d..2ce96594 100644
--- a/README.md
+++ b/README.md
@@ -132,9 +132,10 @@ Also try for example 'admin@xxx.example.com' or 'unknown@example.org'.
 
 If you want a formatted JSON output, you can pipe the result to `jq` or similar.
 
-And to see the full, currently implemented, API, open http://localhost:8080/swagger-ui/index.html (on same port as the API to avoid CORS problems).
-
-If you still need to install some of these tools, find some hints in the next chapters. 
+And to see the full, currently implemented, API, open http://localhost:8080/swagger-ui/index.html).
+For a locally running app without CAS-authentication (export HSADMINNG_CAS_SERVER=''), 
+authorize using the name of the subject (e.g. "superuser-alex@hostsharing.net" in case of test-data).
+Otherwise, use a valid CAS-ticket.
 
 
 ### PostgreSQL Server
diff --git a/bin/howto b/bin/howto
index 0a3b6404..be2aad69 100755
--- a/bin/howto
+++ b/bin/howto
@@ -31,7 +31,7 @@ def search_keywords_in_files(keywords):
         sys.exit(1)
 
     # Allowed comment symbols
-    comment_symbols = {"//", "#", ";"}
+    comment_symbols = {"//", "#", "##", "###", "####", "#####", ";"}
 
     for root, dirs, files in os.walk("."):
         # Ausschließen bestimmter Verzeichnisse
diff --git a/build.gradle b/build.gradle
index f3a12160..4c3f0b19 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '3.4.1'
+    id 'org.springframework.boot' version '3.4.2'
     id 'io.spring.dependency-management' version '1.1.7'        // manages implicit dependencies
     id 'io.openapiprocessor.openapi-processor' version '2023.2' // generates Controller-interface and resources from API-spec
     id 'com.github.jk1.dependency-license-report' version '2.9' // checks dependency-license compatibility
@@ -67,7 +67,6 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
     implementation 'org.springframework.boot:spring-boot-starter-security'
     implementation 'com.github.gavlyukovskiy:datasource-proxy-spring-boot-starter:1.10.0'
-    implementation 'org.springdoc:springdoc-openapi:2.8.3'
     implementation 'org.postgresql:postgresql'
     implementation 'org.liquibase:liquibase-core'
     implementation 'io.hypersistence:hypersistence-utils-hibernate-63:3.9.0'
@@ -77,7 +76,7 @@ dependencies {
     implementation 'net.java.dev.jna:jna:5.16.0'
     implementation 'org.modelmapper:modelmapper:3.2.2'
     implementation 'org.iban4j:iban4j:3.2.10-RELEASE'
-    implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.3'
+    implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.5'
     implementation 'org.reflections:reflections:0.10.2'
 
     compileOnly 'org.projectlombok:lombok'
diff --git a/src/main/java/net/hostsharing/hsadminng/HsadminNgApplication.java b/src/main/java/net/hostsharing/hsadminng/HsadminNgApplication.java
index af29526b..a1180099 100644
--- a/src/main/java/net/hostsharing/hsadminng/HsadminNgApplication.java
+++ b/src/main/java/net/hostsharing/hsadminng/HsadminNgApplication.java
@@ -1,9 +1,11 @@
 package net.hostsharing.hsadminng;
 
+import io.swagger.v3.oas.annotations.OpenAPIDefinition;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
+@OpenAPIDefinition
 public class HsadminNgApplication {
 
     public static void main(String[] args) {
diff --git a/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticationFilter.java b/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticationFilter.java
index 41b0a93e..9bcf148d 100644
--- a/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticationFilter.java
+++ b/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticationFilter.java
@@ -21,12 +21,16 @@ public class CasAuthenticationFilter extends OncePerRequestFilter {
     protected void doFilterInternal(
             HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) {
 
-        if (request.getHeader("Authorization") != null) {
+        request.getInputStream();
+
+        if (request.getHeader("authorization") != null) {
             final var authenticatedRequest = new AuthenticatedHttpServletRequestWrapper(request);
             final var currentSubject = authenticator.authenticate(request);
             authenticatedRequest.addHeader("current-subject", currentSubject);
+            authenticatedRequest.getInputStream();
             filterChain.doFilter(authenticatedRequest, response);
+        } else {
+            filterChain.doFilter(request, response);
         }
-        filterChain.doFilter(request, response);
     }
 }
diff --git a/src/main/java/net/hostsharing/hsadminng/config/NoSecurityRequirement.java b/src/main/java/net/hostsharing/hsadminng/config/NoSecurityRequirement.java
new file mode 100644
index 00000000..70a87cff
--- /dev/null
+++ b/src/main/java/net/hostsharing/hsadminng/config/NoSecurityRequirement.java
@@ -0,0 +1,18 @@
+package net.hostsharing.hsadminng.config;
+
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.TYPE;
+
+/** Explicitly marks a REST-Controller for not requiring authorization for Swagger UI.
+ *
+ * @see SecurityRequirement
+ */
+@Target(TYPE)
+@Retention(RetentionPolicy.CLASS)
+public @interface NoSecurityRequirement {
+}
diff --git a/src/main/java/net/hostsharing/hsadminng/config/RealCasAuthenticator.java b/src/main/java/net/hostsharing/hsadminng/config/RealCasAuthenticator.java
index 66f4c8ed..0ac28059 100644
--- a/src/main/java/net/hostsharing/hsadminng/config/RealCasAuthenticator.java
+++ b/src/main/java/net/hostsharing/hsadminng/config/RealCasAuthenticator.java
@@ -7,7 +7,9 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.security.authentication.BadCredentialsException;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.web.client.RestTemplate;
+import org.w3c.dom.Document;
 import org.xml.sax.SAXException;
 
 import jakarta.servlet.http.HttpServletRequest;
@@ -31,41 +33,68 @@ public class RealCasAuthenticator implements CasAuthenticator {
     public String authenticate(final HttpServletRequest httpRequest) {
         final var userName = StringUtils.isBlank(casServerUrl)
                 ? bypassCurrentSubject(httpRequest)
-                : casValidation(httpRequest);
+                : casAuthentication(httpRequest);
         final var authentication = new UsernamePasswordAuthenticationToken(userName, null, null);
         SecurityContextHolder.getContext().setAuthentication(authentication);
         return authentication.getName();
     }
 
     private static String bypassCurrentSubject(final HttpServletRequest httpRequest) {
-        final var userName = httpRequest.getHeader("current-subject");
+        final var userName = httpRequest.getHeader("authorization").replaceAll("^Bearer ", "");
         System.err.println("CasAuthenticator.bypassCurrentSubject: " + userName);
         return userName;
     }
 
-    private String casValidation(final HttpServletRequest httpRequest)
+    private String casAuthentication(final HttpServletRequest httpRequest)
             throws SAXException, IOException, ParserConfigurationException {
 
-        final var ticket = httpRequest.getHeader("Authorization");
-        final var url = casServerUrl + "/p3/serviceValidate" +
-                "?service=" + serviceUrl +
-                "&ticket=" + ticket;
-
-        System.err.println("CasAuthenticator.casValidation using URL: " + url);
-
-        final var response = ((Supplier<String>) () -> restTemplate.getForObject(url, String.class)).get();
-
-        final var doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
-                .parse(new java.io.ByteArrayInputStream(response.getBytes()));
-        if (doc.getElementsByTagName("cas:authenticationSuccess").getLength() == 0) {
-            System.err.println("CAS service ticket could not be validated");
-            System.err.println("CAS-validation-URL: " + url);
-            System.err.println(response);
-            throw new BadCredentialsException("CAS service ticket could not be validated");
-        }
-        final var userName = doc.getElementsByTagName("cas:user").item(0).getTextContent();
+        final var ticket = httpRequest.getHeader("authorization").replaceAll("^Bearer ", "");
+        final var serviceTicket = ticket.startsWith("TGT-")
+                ? fetchServiceTicket(ticket)
+                : ticket;
+        final var userName = extractUserName(verifyServiceTicket(serviceTicket));
         System.err.println("CAS-user: " + userName);
         return userName;
     }
 
+    private String fetchServiceTicket(final String ticketGrantingTicket) {
+        final var tgtUrl = casServerUrl + "/cas/v1/tickets/" + ticketGrantingTicket;
+
+        final var restTemplate = new RestTemplate();
+        final var formData = new LinkedMultiValueMap<String, String>();
+        formData.add("service", serviceUrl);
+
+        return restTemplate.postForObject(tgtUrl, formData, String.class);
+    }
+
+    private Document verifyServiceTicket(final String serviceTicket) throws SAXException, IOException, ParserConfigurationException {
+        if ( !serviceTicket.startsWith("ST-") ) {
+            throwBadCredentialsException("Invalid authorization ticket");
+        }
+
+        final var url = casServerUrl + "/cas/p3/serviceValidate" +
+                "?service=" + serviceUrl +
+                "&ticket=" + serviceTicket;
+
+        final var response = ((Supplier<String>) () -> restTemplate.getForObject(url, String.class)).get();
+
+        return DocumentBuilderFactory.newInstance().newDocumentBuilder()
+                .parse(new java.io.ByteArrayInputStream(response.getBytes()));
+
+    }
+
+    private String extractUserName(final Document verification) {
+
+        if (verification.getElementsByTagName("cas:authenticationSuccess").getLength() == 0) {
+            System.err.println("CAS service ticket could not be validated");
+            System.err.println(verification);
+            throwBadCredentialsException("CAS service ticket could not be validated");
+        }
+        return verification.getElementsByTagName("cas:user").item(0).getTextContent();
+    }
+
+    private String throwBadCredentialsException(final String message) {
+        throw new BadCredentialsException(message);
+    }
+
 }
diff --git a/src/main/java/net/hostsharing/hsadminng/config/WebSecurityConfig.java b/src/main/java/net/hostsharing/hsadminng/config/WebSecurityConfig.java
index 4bcae65a..a11fb592 100644
--- a/src/main/java/net/hostsharing/hsadminng/config/WebSecurityConfig.java
+++ b/src/main/java/net/hostsharing/hsadminng/config/WebSecurityConfig.java
@@ -1,5 +1,8 @@
 package net.hostsharing.hsadminng.config;
 
+import io.swagger.v3.oas.annotations.enums.SecuritySchemeIn;
+import io.swagger.v3.oas.annotations.enums.SecuritySchemeType;
+import io.swagger.v3.oas.annotations.security.SecurityScheme;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -15,6 +18,8 @@ import jakarta.servlet.http.HttpServletResponse;
 
 @Configuration
 @EnableWebSecurity
+// TODO.impl: securitySchemes should work in OpenAPI yaml, but the Spring templates seem not to support it
+@SecurityScheme(type = SecuritySchemeType.HTTP, name = "casTicket", scheme = "bearer", bearerFormat = "CAS ticket", description = "CAS ticket", in = SecuritySchemeIn.HEADER)
 public class WebSecurityConfig {
 
     private static final String[] PERMITTED_PATHS = new String[] { "/swagger-ui/**", "/v3/api-docs/**", "/actuator/**" };
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java b/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
index 6b563041..685b30d7 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java
@@ -3,6 +3,7 @@ package net.hostsharing.hsadminng.hs.booking.item;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.api.HsBookingItemsApi;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemInsertResource;
@@ -32,6 +33,7 @@ import static net.hostsharing.hsadminng.mapper.PostgresDateRange.toPostgresDateR
 
 @RestController
 @Profile("!only-office")
+@SecurityRequirement(name = "casTicket")
 public class HsBookingItemController implements HsBookingItemsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProjectController.java b/src/main/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProjectController.java
index 11c135dd..acc5957b 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProjectController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/booking/project/HsBookingProjectController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.booking.project;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorRepository;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.api.HsBookingProjectsApi;
@@ -22,6 +23,7 @@ import java.util.function.BiConsumer;
 
 @RestController
 @Profile("!only-office")
+@SecurityRequirement(name = "casTicket")
 public class HsBookingProjectController implements HsBookingProjectsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetController.java b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetController.java
index 7d12d714..6c36d21f 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.hosting.asset;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRealRepository;
 import net.hostsharing.hsadminng.hs.hosting.asset.validators.HostingAssetEntitySaveProcessor;
 import net.hostsharing.hsadminng.hs.hosting.asset.validators.HostingAssetEntityValidatorRegistry;
@@ -29,6 +30,7 @@ import java.util.function.BiConsumer;
 
 @RestController
 @Profile("!only-office")
+@SecurityRequirement(name = "casTicket")
 public class HsHostingAssetController implements HsHostingAssetsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsController.java b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsController.java
index d843ff87..bea792ba 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.hosting.asset;
 
 import io.micrometer.core.annotation.Timed;
+import net.hostsharing.hsadminng.config.NoSecurityRequirement;
 import net.hostsharing.hsadminng.hs.hosting.asset.validators.HostingAssetEntityValidatorRegistry;
 import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.api.HsHostingAssetPropsApi;
 import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.model.HsHostingAssetTypeResource;
@@ -14,6 +15,7 @@ import java.util.Map;
 
 @RestController
 @Profile("!only-office")
+@NoSecurityRequirement
 public class HsHostingAssetPropsController implements HsHostingAssetPropsApi {
 
     @Override
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/bankaccount/HsOfficeBankAccountController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/bankaccount/HsOfficeBankAccountController.java
index 37b9d404..86b82955 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/bankaccount/HsOfficeBankAccountController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/bankaccount/HsOfficeBankAccountController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.bankaccount;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeBankAccountsApi;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeBankAccountInsertResource;
@@ -18,7 +19,7 @@ import java.util.List;
 import java.util.UUID;
 
 @RestController
-
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeBankAccountController implements HsOfficeBankAccountsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactController.java
index bf8a9c09..7022d515 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/contact/HsOfficeContactController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.contact;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeContactsApi;
@@ -20,6 +21,7 @@ import java.util.UUID;
 import static net.hostsharing.hsadminng.errors.Validate.validate;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeContactController implements HsOfficeContactsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionController.java
index 9073e564..01401eef 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/coopassets/HsOfficeCoopAssetsTransactionController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.coopassets;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.errors.MultiValidationException;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeCoopAssetsApi;
@@ -37,6 +38,7 @@ import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOffic
 import static net.hostsharing.hsadminng.lambda.WithNonNull.withNonNull;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeCoopAssetsTransactionController implements HsOfficeCoopAssetsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
index 5583d44e..9f42f413 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/coopshares/HsOfficeCoopSharesTransactionController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.coopshares;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.errors.MultiValidationException;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeCoopSharesApi;
@@ -27,6 +28,7 @@ import static net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOffic
 import static net.hostsharing.hsadminng.hs.validation.UuidResolver.resolve;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeCoopSharesTransactionController implements HsOfficeCoopSharesApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorController.java
index 2e0ff210..5f709bda 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.debitor;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.bankaccount.HsOfficeBankAccountRepository;
 import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactRealRepository;
@@ -32,7 +33,7 @@ import static net.hostsharing.hsadminng.hs.validation.UuidResolver.resolve;
 import static net.hostsharing.hsadminng.repr.TaggedNumber.cropTag;
 
 @RestController
-
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeDebitorController implements HsOfficeDebitorsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipController.java
index edf5d0a6..4c24d1e1 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.membership;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficeMembershipsApi;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.model.HsOfficeMembershipInsertResource;
@@ -24,6 +25,7 @@ import static net.hostsharing.hsadminng.errors.Validate.validate;
 import static net.hostsharing.hsadminng.repr.TaggedNumber.cropTag;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeMembershipController implements HsOfficeMembershipsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerController.java
index 6074c909..f99b290b 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.partner;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.errors.ReferenceNotFoundException;
 import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactFromResourceConverter;
@@ -35,7 +36,7 @@ import static net.hostsharing.hsadminng.hs.office.relation.HsOfficeRelationType.
 import static net.hostsharing.hsadminng.repr.TaggedNumber.cropTag;
 
 @RestController
-
+@SecurityRequirement(name = "casTicket")
 public class HsOfficePartnerController implements HsOfficePartnersApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/person/HsOfficePersonController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/person/HsOfficePersonController.java
index 28a1b56f..ff763bbe 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/person/HsOfficePersonController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/person/HsOfficePersonController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.person;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.generated.api.v1.api.HsOfficePersonsApi;
@@ -17,7 +18,7 @@ import java.util.List;
 import java.util.UUID;
 
 @RestController
-
+@SecurityRequirement(name = "casTicket")
 public class HsOfficePersonController implements HsOfficePersonsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java
index 53e2712b..2473b7ad 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/relation/HsOfficeRelationController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.relation;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.errors.Validate;
 import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactRealEntity;
@@ -26,6 +27,7 @@ import java.util.function.BiConsumer;
 import static net.hostsharing.hsadminng.mapper.KeyValueMap.from;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeRelationController implements HsOfficeRelationsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/sepamandate/HsOfficeSepaMandateController.java b/src/main/java/net/hostsharing/hsadminng/hs/office/sepamandate/HsOfficeSepaMandateController.java
index 61399d1e..ad19fb42 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/sepamandate/HsOfficeSepaMandateController.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/sepamandate/HsOfficeSepaMandateController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.hs.office.sepamandate;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.office.bankaccount.HsOfficeBankAccountRepository;
 import net.hostsharing.hsadminng.hs.office.debitor.HsOfficeDebitorRepository;
@@ -26,7 +27,7 @@ import java.util.function.BiConsumer;
 import static net.hostsharing.hsadminng.mapper.PostgresDateRange.toPostgresDateRange;
 
 @RestController
-
+@SecurityRequirement(name = "casTicket")
 public class HsOfficeSepaMandateController implements HsOfficeSepaMandatesApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantController.java b/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantController.java
index 02dc6ae2..21389e1b 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantController.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.rbac.grant;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.rbac.generated.api.v1.api.RbacGrantsApi;
@@ -17,6 +18,7 @@ import java.util.List;
 import java.util.UUID;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class RbacGrantController implements RbacGrantsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/role/RbacRoleController.java b/src/main/java/net/hostsharing/hsadminng/rbac/role/RbacRoleController.java
index de7446e8..dc12465d 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/role/RbacRoleController.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/role/RbacRoleController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.rbac.role;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.rbac.generated.api.v1.api.RbacRolesApi;
@@ -13,6 +14,7 @@ import org.springframework.web.bind.annotation.RestController;
 import java.util.List;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class RbacRoleController implements RbacRolesApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/subject/RbacSubjectController.java b/src/main/java/net/hostsharing/hsadminng/rbac/subject/RbacSubjectController.java
index c893fb98..f47e7159 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/subject/RbacSubjectController.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/subject/RbacSubjectController.java
@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.rbac.subject;
 
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.rbac.generated.api.v1.api.RbacSubjectsApi;
@@ -16,6 +17,7 @@ import java.util.List;
 import java.util.UUID;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class RbacSubjectController implements RbacSubjectsApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/test/cust/TestCustomerController.java b/src/main/java/net/hostsharing/hsadminng/rbac/test/cust/TestCustomerController.java
index 82e3a57d..d8e15cfd 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/test/cust/TestCustomerController.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/test/cust/TestCustomerController.java
@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.rbac.test.cust;
 
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.test.generated.api.v1.api.TestCustomersApi;
@@ -15,6 +16,7 @@ import jakarta.persistence.PersistenceContext;
 import java.util.List;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class TestCustomerController implements TestCustomersApi {
 
     @Autowired
diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/test/pac/TestPackageController.java b/src/main/java/net/hostsharing/hsadminng/rbac/test/pac/TestPackageController.java
index 43fd3b0b..86735af0 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/test/pac/TestPackageController.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/test/pac/TestPackageController.java
@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.rbac.test.pac;
 
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.mapper.StrictMapper;
 import net.hostsharing.hsadminng.mapper.OptionalFromJson;
 import net.hostsharing.hsadminng.context.Context;
@@ -15,6 +16,7 @@ import java.util.List;
 import java.util.UUID;
 
 @RestController
+@SecurityRequirement(name = "casTicket")
 public class TestPackageController implements TestPackagesApi {
 
     @Autowired
diff --git a/src/main/resources/api-definition/test/test-customers.yaml b/src/main/resources/api-definition/test/test-customers.yaml
index 8e81426a..017608e2 100644
--- a/src/main/resources/api-definition/test/test-customers.yaml
+++ b/src/main/resources/api-definition/test/test-customers.yaml
@@ -4,6 +4,7 @@ get:
     tags:
         - testCustomers
     operationId: listCustomers
+
     parameters:
         - $ref: 'auth.yaml#/components/parameters/currentSubject'
         - $ref: 'auth.yaml#/components/parameters/assumedRoles'
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 7abab833..f50899b6 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -57,7 +57,7 @@ spring:
 # keep this in sync with test/.../application.yml
 springdoc:
     # SwaggerUI must run on the same port as the API itself, otherwise CORS will block accessing the API
-    use-management-port: false
+    x-use-management-port: false
 
 hsadminng:
     postgres:
@@ -72,3 +72,9 @@ metrics:
             http:
                 server:
                     requests: true
+
+logging:
+    level:
+        org:
+            springframework:
+                security: TRACE
diff --git a/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java b/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
index 664b803c..628cf5d7 100644
--- a/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
@@ -11,7 +11,9 @@ import com.tngtech.archunit.lang.ArchRule;
 import com.tngtech.archunit.lang.ConditionEvents;
 import com.tngtech.archunit.lang.SimpleConditionEvent;
 import io.micrometer.core.annotation.Timed;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import net.hostsharing.hsadminng.HsadminNgApplication;
+import net.hostsharing.hsadminng.config.NoSecurityRequirement;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItem;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetRbacEntity;
 import net.hostsharing.hsadminng.rbac.context.ContextBasedTest;
@@ -352,6 +354,15 @@ public class ArchitectureTest {
     static final ArchRule restControllerNaming =
         classes().that().areAnnotatedWith(RestController.class).should().haveSimpleNameEndingWith("Controller");
 
+    @ArchTest
+    @SuppressWarnings("unused")
+    static final ArchRule restControllerSecurityRequirement =
+            // TODO.impl: seems that the Spring templates for the OpenAPI generator don't support this,
+            //  thus we need this annotation to support Swagger UI authorization.
+            classes().that().areAnnotatedWith(RestController.class).should()
+                    .beAnnotatedWith(SecurityRequirement.class).orShould()
+                    .beAnnotatedWith(NoSecurityRequirement.class);
+
     @ArchTest
     @SuppressWarnings("unused")
     static final ArchRule restControllerMethods = classes()
diff --git a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
index 17c1a582..90238fc1 100644
--- a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
@@ -19,7 +19,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static com.github.tomakehurst.wiremock.client.WireMock.*;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-@TestPropertySource(properties = {"server.port=0", "hsadminng.cas.server=http://localhost:8088/cas"})
+@TestPropertySource(properties = {"server.port=0", "hsadminng.cas.server=http://localhost:8088"})
 @ActiveProfiles("wiremock") // IMPORTANT: To test prod config, do not use test profile!
 @Tag("generalIntegrationTest")
 class CasAuthenticationFilterIntegrationTest {
@@ -40,7 +40,7 @@ class CasAuthenticationFilterIntegrationTest {
     public void shouldAcceptRequestWithValidCasTicket() {
         // given
         final var username = "test-user-" + randomAlphanumeric(4);
-        wireMockServer.stubFor(get(urlEqualTo("/cas/p3/serviceValidate?service=" + serviceUrl + "&ticket=valid"))
+        wireMockServer.stubFor(get(urlEqualTo("/cas/p3/serviceValidate?service=" + serviceUrl + "&ticket=ST-valid"))
                 .willReturn(aResponse()
                         .withStatus(200)
                         .withBody("""
@@ -56,7 +56,7 @@ class CasAuthenticationFilterIntegrationTest {
         final var result = restTemplate.exchange(
                 "http://localhost:" + this.serverPort + "/api/ping",
                 HttpMethod.GET,
-                new HttpEntity<>(null, headers("Authorization", "valid")),
+                new HttpEntity<>(null, headers("Authorization", "ST-valid")),
                 String.class
         );
 
diff --git a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticatorUnitTest.java b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticatorUnitTest.java
index f8f2bfc1..c2953c3f 100644
--- a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticatorUnitTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticatorUnitTest.java
@@ -17,7 +17,8 @@ class CasAuthenticatorUnitTest {
 
         // given
         final var request = mock(HttpServletRequest.class);
-        given(request.getHeader("current-subject")).willReturn("given-user");
+        // bypassing the CAS-server HTTP-request fakes the user from the authorization header's fake CAS-ticket
+        given(request.getHeader("authorization")).willReturn("Bearer given-user");
 
         // when
         final var userName = casAuthenticator.authenticate(request);
diff --git a/src/test/java/net/hostsharing/hsadminng/config/WebSecurityConfigIntegrationTest.java b/src/test/java/net/hostsharing/hsadminng/config/WebSecurityConfigIntegrationTest.java
index 8ce18a45..be993747 100644
--- a/src/test/java/net/hostsharing/hsadminng/config/WebSecurityConfigIntegrationTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/config/WebSecurityConfigIntegrationTest.java
@@ -20,13 +20,15 @@ import org.springframework.test.context.TestPropertySource;
 
 import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
 import static com.github.tomakehurst.wiremock.client.WireMock.anyUrl;
+import static com.github.tomakehurst.wiremock.client.WireMock.equalTo;
 import static com.github.tomakehurst.wiremock.client.WireMock.get;
+import static com.github.tomakehurst.wiremock.client.WireMock.post;
 import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;
 import static java.util.Map.entry;
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-@TestPropertySource(properties = {"management.port=0", "server.port=0", "hsadminng.cas.server=http://localhost:8088/cas"})
+@TestPropertySource(properties = {"management.port=0", "server.port=0", "hsadminng.cas.server=http://localhost:8088"})
 @ActiveProfiles("wiremock") // IMPORTANT: To test prod config, do not use test profile!
 @Tag("generalIntegrationTest")
 class WebSecurityConfigIntegrationTest {
@@ -59,20 +61,55 @@ class WebSecurityConfigIntegrationTest {
     }
 
     @Test
-    void accessToApiWithValidTokenShouldBePermitted() {
+    void accessToApiWithValidServiceTicketSouldBePermitted() {
         // given
-        givenCasTicketValidationResponse("fake-cas-ticket");
+        givenCasTicketValidationResponse("ST-fake-cas-ticket", "fake-user-name");
 
         // http request
         final var result = restTemplate.exchange(
                 "http://localhost:" + this.serverPort + "/api/ping",
                 HttpMethod.GET,
-                httpHeaders(entry("Authorization", "fake-cas-ticket")),
+                httpHeaders(entry("Authorization", "Bearer ST-fake-cas-ticket")),
                 String.class
         );
 
         assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
-        assertThat(result.getBody()).startsWith("pong fake-cas-ticket");
+        assertThat(result.getBody()).startsWith("pong fake-user-name");
+    }
+
+    @Test
+    void accessToApiWithValidTicketGrantingTicketShouldBePermitted() {
+        // given
+        givenCasServiceTicketForTicketGrantingTicket("TGT-fake-cas-ticket", "ST-fake-cas-ticket");
+        givenCasTicketValidationResponse("ST-fake-cas-ticket", "fake-user-name");
+
+        // http request
+        final var result = restTemplate.exchange(
+                "http://localhost:" + this.serverPort + "/api/ping",
+                HttpMethod.GET,
+                httpHeaders(entry("Authorization", "Bearer TGT-fake-cas-ticket")),
+                String.class
+        );
+
+        assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
+        assertThat(result.getBody()).startsWith("pong fake-user-name");
+    }
+
+    @Test
+    void accessToApiWithInvalidTicketGrantingTicketShouldBePermitted() {
+        // given
+        givenCasServiceTicketForTicketGrantingTicket("TGT-fake-cas-ticket", "ST-fake-cas-ticket");
+        givenCasTicketValidationResponse("ST-fake-cas-ticket", "fake-user-name");
+
+        // http request
+        final var result = restTemplate.exchange(
+                "http://localhost:" + this.serverPort + "/api/ping",
+                HttpMethod.GET,
+                httpHeaders(entry("Authorization", "Bearer TGT-WRONG-cas-ticket")),
+                String.class
+        );
+
+        assertThat(result.getStatusCode()).isEqualTo(HttpStatus.UNAUTHORIZED);
     }
 
     @Test
@@ -85,13 +122,13 @@ class WebSecurityConfigIntegrationTest {
     @Test
     void accessToApiWithInvalidTokenShouldBeDenied() {
         // given
-        givenCasTicketValidationResponse("fake-cas-ticket");
+        givenCasTicketValidationResponse("ST-fake-cas-ticket", "fake-user-name");
 
         // when
         final var result = restTemplate.exchange(
                 "http://localhost:" + this.serverPort + "/api/ping",
                 HttpMethod.GET,
-                httpHeaders(entry("Authorization", "WRONG-cas-ticket")),
+                httpHeaders(entry("Authorization", "Bearer ST-WRONG-cas-ticket")),
                 String.class
         );
 
@@ -129,17 +166,25 @@ class WebSecurityConfigIntegrationTest {
         assertThat(result.getBody().get("status")).isEqualTo("UP");
     }
 
-    private void givenCasTicketValidationResponse(final String casToken) {
+    private void givenCasServiceTicketForTicketGrantingTicket(final String ticketGrantingTicket, final String serviceTicket) {
+        wireMockServer.stubFor(post(urlEqualTo("/cas/v1/tickets/" + ticketGrantingTicket))
+                .withFormParam("service", equalTo(serviceUrl))
+                .willReturn(aResponse()
+                        .withStatus(201)
+                        .withBody(serviceTicket)));
+    }
+
+    private void givenCasTicketValidationResponse(final String casToken, final String userName) {
         wireMockServer.stubFor(get(urlEqualTo("/cas/p3/serviceValidate?service=" + serviceUrl + "&ticket=" + casToken))
                 .willReturn(aResponse()
                         .withStatus(200)
                         .withBody("""
                                 <cas:serviceResponse xmlns:cas='http://www.yale.edu/tp/cas'>
                                     <cas:authenticationSuccess>
-                                        <cas:user>${casToken}</cas:user>
+                                        <cas:user>${userName}</cas:user>
                                     </cas:authenticationSuccess>
                                 </cas:serviceResponse>
-                                """.replace("${casToken}", casToken))));
+                                """.replace("${userName}", userName))));
     }
 
     @SafeVarargs
diff --git a/src/test/resources/application.yml b/src/test/resources/application.yml
index abf049a6..c728db3b 100644
--- a/src/test/resources/application.yml
+++ b/src/test/resources/application.yml
@@ -42,7 +42,7 @@ spring:
 # keep this in sync with main/.../application.yml
 springdoc:
     # SwaggerUI must run on the same port as the API itself, otherwise CORS will block accessing the API
-    use-management-port: false
+    x-use-management-port: false
 
 
 logging: