CVE-2026-41661
CVE-2026-41661 · Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Admidio is an open-source user management solution. Prior to version 5.0.9, an unauthenticated attacker can execute arbitrary JavaScript in any Admidio user's browser through a reflected XSS in system/msg_window.php. The endpoint passes user input through htmlspecialchars(), which does not encode square brackets. A subsequent call to Language::prepareTextPlaceholders() converts those brackets into HTML angle brackets, producing executable markup. This issue has been patched in version 5.0.9.
CVSS 6.1 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
admidio
- Versions
- < 5.0.9: Affected
No fix published
admidio/admidio Packagist
- Versions
- 4.1.0
- 4.1.3
- v4.2-Beta.1
- v4.2-Beta.2
- v4.2-Beta.3
- v4.2.0
- v4.2.1
- v4.2.10
- v4.2.11
- v4.2.12
- v4.2.13
- v4.2.14
- v4.2.2
- v4.2.3
- v4.2.4
- v4.2.5
- v4.2.6
- v4.2.7
- v4.2.8
- v4.2.9
- v4.3-Beta.1
- v4.3-Beta.3
- v4.3-Beta.4
- v4.3-Beta.5
- v4.3.0
- v4.3.1
- v4.3.10
- v4.3.11
- v4.3.12
- v4.3.13
- v4.3.14
- v4.3.15
- v4.3.16
- v4.3.17
- v4.3.2
- v4.3.3
- v4.3.4
- v4.3.5
- v4.3.6
- v4.3.7
- v4.3.8
- v4.3.9
- v5.0-Beta.1
- v5.0-Beta.2
- v5.0-Beta.3
- v5.0.0
- v5.0.1
- v5.0.2
- v5.0.3
- v5.0.4
- v5.0.5
- v5.0.6
- v5.0.7
- v5.0.8
- Affected ranges
- ECOSYSTEM: < 5.0.9
Update to 5.0.9