CVE-2026-41661
Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion
MEDIUM 6.1EPSS 0.3%
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.
- Affected
- Admidio · admidio
- CVSS v3.1 GITHUB
- 6.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS
- 0.29% chance of exploitation in the next 30 days, 20th percentile
- Published
- 2026-05-07