From 7dd8f9c17febec764d515e0e9e151ae3d6736e19 Mon Sep 17 00:00:00 2001
From: Elmar Ludwig <elmar.ludwig@uni-osnabrueck.de>
Date: Fri, 27 Feb 2026 15:39:03 +0100
Subject: use RFC 5987 encoding when value contains `%`, fixes #6214

Closes #6214

Merge request studip/studip!4760
---
 lib/functions.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/functions.php b/lib/functions.php
index ff71ea9..df63256 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -767,7 +767,7 @@ function legacy_studip_utf8decode($data)
  */
 function encode_header_parameter($name, $value)
 {
-    if (preg_match('/[\200-\377]/', $value)) {
+    if (preg_match('/[%\200-\377]/', $value)) {
         // use RFC 5987 encoding (ext-parameter)
         return $name . "*=UTF-8''" . rawurlencode($value);
     } else {
-- 
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