diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 1f142bb0dc..d7f8e400f5 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -247,6 +247,7 @@ public function updateCSP() {
 				foreach ($trustedList as $server) {
 					$policy->addAllowedFrameDomain($server);
 					$this->addTrustedRemote($policy, $server);
+					$policy->addAllowedFormActionDomain($server);
 				}
 			}
 			$remoteAccess = $container->getServer()->getRequest()->getParam('richdocuments_remote_access');