CVE-2026-41661 — Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion
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 …
Published: 2026-05-07 · CVSS: 6.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7