git subrepo commit (merge) mailcow/src/mailcow-dockerized

subrepo: subdir:   "mailcow/src/mailcow-dockerized"
  merged:   "32243e56"
upstream: origin:   "https://github.com/mailcow/mailcow-dockerized.git"
  branch:   "master"
  commit:   "e2b4b6f6"
git-subrepo: version:  "0.4.3"
  origin:   "???"
  commit:   "???"
Change-Id: I51e2016ef5ab88a8b0bdc08551b18f48ceef0aa5
diff --git a/mailcow/src/mailcow-dockerized/data/web/autodiscover-json.php b/mailcow/src/mailcow-dockerized/data/web/autodiscover-json.php
index e1749b7..2fa9699 100644
--- a/mailcow/src/mailcow-dockerized/data/web/autodiscover-json.php
+++ b/mailcow/src/mailcow-dockerized/data/web/autodiscover-json.php
@@ -16,6 +16,6 @@
 }
 else {
   http_response_code(400);
-  echo '{"ErrorCode":"InvalidProtocol","ErrorMessage":"The given protocol value \u0027' . $_GET['Protocol'] . '\u0027 is invalid. Supported values are \u0027ActiveSync,AutodiscoverV1\u0027"}';
+  echo '{"ErrorCode":"InvalidProtocol","ErrorMessage":"The given protocol value \u0027' . preg_replace("/[^\da-z]/i", '', $_GET['Protocol']) . '\u0027 is invalid. Supported values are \u0027ActiveSync,AutodiscoverV1\u0027"}';
 }
 ?>