diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab8d71789cf782587144c1faed42dee3cb86af8e..92f67afb034e9730ab6d1c62d15bcd43f270fc4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 2.0.3
+This release fixes a security vulnerability in the account management API. It is
+highly recommended to upgrade if you are using database authentication.
+
+Additional changes:
+* Libraries have been upgraded to fix potential bugs
+* Some unnecessary log warnings for Websocket communication are filtered
+
 ## 2.1
 Major features:
 * Public Pool (experimental): It is now possible to share sessions with other
diff --git a/src/main/java/de/thm/arsnova/controller/UserController.java b/src/main/java/de/thm/arsnova/controller/UserController.java
index 0c5e2403e0048d3312c182c33d0d1ad759ab9282..b56e6f9b20c08f1476391990f3cd34bd28d58a6b 100644
--- a/src/main/java/de/thm/arsnova/controller/UserController.java
+++ b/src/main/java/de/thm/arsnova/controller/UserController.java
@@ -94,7 +94,7 @@ public class UserController extends AbstractController {
 		response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
 	}
 
-	@RequestMapping(value = { "/{username}" }, method = RequestMethod.DELETE)
+	@RequestMapping(value = { "/{username}/" }, method = RequestMethod.DELETE)
 	public final void activate(
 			@PathVariable final String username,
 			final HttpServletRequest request,
diff --git a/src/main/java/de/thm/arsnova/services/UserService.java b/src/main/java/de/thm/arsnova/services/UserService.java
index 6ea5398051859444da664560c7b78e94c46902b7..222991cc7be284f5cea1bc3123d06754ac397d2e 100644
--- a/src/main/java/de/thm/arsnova/services/UserService.java
+++ b/src/main/java/de/thm/arsnova/services/UserService.java
@@ -425,7 +425,7 @@ public class UserService implements IUserService {
 	public DbUser deleteDbUser(String username) {
 		User user = getCurrentUser();
 		if (!user.getUsername().equals(username)
-				&& SecurityContextHolder.getContext().getAuthentication().getAuthorities()
+				&& !SecurityContextHolder.getContext().getAuthentication().getAuthorities()
 						.contains(new SimpleGrantedAuthority("ROLE_ADMIN"))) {
 			throw new UnauthorizedException();
 		}