diff --git a/lib/Listener/CSPListener.php b/lib/Listener/CSPListener.php
index 3bc84138e07..edb6bb80230 100644
--- a/lib/Listener/CSPListener.php
+++ b/lib/Listener/CSPListener.php
@@ -47,6 +47,7 @@ public function handle(Event $event): void {
 
 		$csp = new ContentSecurityPolicy();
 		$csp->addAllowedImageDomain('https://*.tile.openstreetmap.org');
+		$csp->addAllowedMediaDomain('blob:');
 		$csp->addAllowedWorkerSrcDomain('blob:');
 		$csp->addAllowedWorkerSrcDomain("'self'");
 		$csp->addAllowedChildSrcDomain('blob:');