CVE-2026-41661

MEDIUM 6.1EPSS 0.2%

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 v3.1: 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v3.1: 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.18% chance of exploitation in the next 30 days, 8th percentile
Published: 2026-05-07

Proof-of-concept exploits (1)

advisories/GHSA-gq27-fc8w-vcmp

References

CVE Record
NVD entry

CVE-2026-41661

Proof-of-concept exploits (1)

References

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