From 5b794550b4fa0bc892d924088466bf0065ecf2d7 Mon Sep 17 00:00:00 2001
From: Thomas Hackl <hackl@data-quest.de>
Date: Tue, 5 Aug 2025 14:08:17 +0200
Subject: Resolve BIEST 5764

Closes #5764

Merge request studip/studip!4404
---
 lib/functions.php  | 4 ++++
 lib/visual.inc.php | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/lib/functions.php b/lib/functions.php
index 3198cb1..ff71ea9 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -815,6 +815,10 @@ function get_title_for_status($type, $count, $sem_type = NULL)
  */
 function is_internal_url($url)
 {
+    if (mb_substr($url, 0, 2) === '//') {
+        $url = Request::protocol() . ':' . $url;
+    }
+
     if (preg_match('%^[a-z]+:%', $url)) {
         return mb_strpos($url, $GLOBALS['ABSOLUTE_URI_STUDIP']) === 0;
     }
diff --git a/lib/visual.inc.php b/lib/visual.inc.php
index b400ca9..67c8c31 100644
--- a/lib/visual.inc.php
+++ b/lib/visual.inc.php
@@ -272,6 +272,10 @@ function isURL($url) {
 }
 
 function isLinkIntern($url) {
+    if (mb_substr($url, 0, 2) === '//') {
+        $url = Request::protocol() . ':' . $url;
+    }
+
     $pum = @parse_url(TransformInternalLinks($url));
 
     if (!$pum) {
-- 
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