diff --git a/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticator.java b/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticator.java
index 278b5470..aa580fbf 100644
--- a/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticator.java
+++ b/src/main/java/net/hostsharing/hsadminng/config/CasAuthenticator.java
@@ -31,12 +31,13 @@ public class CasAuthenticator implements Authenticator {
 
         final var doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
                 .parse(new java.io.ByteArrayInputStream(response.getBytes()));
-        if ( doc.getElementsByTagName("cas:authenticationSuccess").getLength() == 0 ) {
+        if (doc.getElementsByTagName("cas:authenticationSuccess").getLength() == 0) {
             // TODO.impl: for unknown reasons, this results in a 403 FORBIDDEN
             // throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "CAS service ticket could not be validated");
             throw new BadCredentialsException("CAS service ticket could not be validated");
         }
-        final var authentication = new UsernamePasswordAuthenticationToken("test-user-from-authenticate", null, null); // TODO
+        final var userName = doc.getElementsByTagName("cas:user").item(0).getTextContent();
+        final var authentication = new UsernamePasswordAuthenticationToken(userName, null, null);
         SecurityContextHolder.getContext().setAuthentication(authentication);
         return authentication.getName();
     }
diff --git a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
index 3cb13840..c470ba4a 100644
--- a/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java
@@ -13,7 +13,7 @@ import org.springframework.http.HttpStatus;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.TestPropertySource;
 
-
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphanumeric;
 import static org.assertj.core.api.Assertions.assertThat;
 import static com.github.tomakehurst.wiremock.client.WireMock.*;
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@@ -33,16 +33,18 @@ class CasAuthenticationFilterIntegrationTest {
     @Test
     public void shouldAcceptRequest() {
         // given
+        final var username = "test-user-" + randomAlphanumeric(4);
         wireMockServer.stubFor(get(urlEqualTo("/cas/p3/serviceValidate?service=http://localhost:8080/api&ticket=valid"))
                 .willReturn(aResponse()
                         .withStatus(200)
                         .withBody("""
                                 <cas:serviceResponse xmlns:cas='http://www.yale.edu/tp/cas'>
                                     <cas:authenticationSuccess>
-                                        <cas:user>test-user</cas:user>
+                                        <cas:user>%{username}</cas:user>
                                     </cas:authenticationSuccess>
                                 </cas:serviceResponse>
-                                """)));
+                                """.replace("%{username}", username)
+                        )));
 
         // when
         final var result = restTemplate.exchange(
@@ -54,7 +56,7 @@ class CasAuthenticationFilterIntegrationTest {
 
         // then
         assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
-        assertThat(result.getBody()).isEqualTo("pong test-user-from-authenticate\n");
+        assertThat(result.getBody()).isEqualTo("pong " + username + "\n");
     }
 
     @Test