diff --git a/src/EventListener/AccessDeniedListener.php b/src/EventListener/AccessDeniedListener.php
new file mode 100644
index 0000000..f4059a6
--- /dev/null
+++ b/src/EventListener/AccessDeniedListener.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace App\EventListener;
+
+use Psr\Log\LoggerInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+
+#[AsEventListener(event: KernelEvents::EXCEPTION, method: 'onKernelException', priority: 2)]
+class AccessDeniedListener
+{
+    public function __construct(
+        private readonly Security $security,
+        private readonly LoggerInterface $logger,
+    ) {
+    }
+
+    public function onKernelException(ExceptionEvent $event): void
+    {
+        $exception = $event->getThrowable();
+
+        if (false === $exception instanceof AccessDeniedException) {
+            return;
+        }
+
+        $request = $event->getRequest();
+        $route = $request->attributes->get('_route');
+
+        // Treat OAuth2 routes differently
+        if (in_array($route, ['oauth2_authorize', 'oauth2_token'])) {
+            $request->getSession()->getFlashBag()->add('info', 'Bitte melde dich an.');
+
+            $this->logger->info('OAuth2 authorization request', [
+                'uri' => $request->getRequestUri(),
+            ]);
+
+            return;
+        }
+
+        if (null === $this->security->getUser()) {
+            $request->getSession()->getFlashBag()->add('info', 'Bitte melde dich an.');
+        } else {
+            $request->getSession()->getFlashBag()->add('error', 'Zugriff verweigert');
+            // Unset potentially set target path to avoid access denied errors
+            $request->getSession()->remove('_security.main.target_path');
+        }
+
+        $this->logger->warning('Access denied', [
+            'uri' => $request->getRequestUri(),
+        ]);
+    }
+}