CVE-2026-41661 Details
Description
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.
A reflected cross-site scripting vulnerability has been identified in Admidio versions prior to 5.0.9. The issue allows an unauthenticated attacker to execute arbitrary JavaScript in the browser of any Admidio user. This vulnerability arises in the system/msg_window.php file, where user input is not properly sanitized before being processed. The endpoint uses htmlspecialchars() to encode certain characters, but this function does not handle square brackets. Subsequently, the Language::prepareTextPlaceholders() function converts these brackets into HTML angle brackets, creating executable script tags. The vulnerability has been patched in Admidio version 5.0.9.
Users are advised to update to Admidio version 5.0.9, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 7, 2026CISA-ADP
Assessed May 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Admidio/admidio/releases/tag/v5.0.9 | [email protected] | Release NotesVendor |
| https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Admidio | <= 5.0.8 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 7, 2026 | CVE Modified | CISA-ADP |
| May 7, 2026 | New CVE Received | [email protected] |