---
cve: "CVE-2026-41661"
severity: "MEDIUM"
cvss: 6.1
epss: "18%"
vendor: "Admidio"
kev: false
exploited: false
published: "2026-05-07 02:59:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T22:35:56+02:00"
---

# CVE-2026-41661

> 6.1 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- d39915697e6e0be04d02d55a46c631f53013aea6 (Commit)

## Referenzen

- <https://github.com/Admidio/admidio/security/advisories/GHSA-gq27-fc8w-vcmp>
- <https://github.com/Admidio/admidio/releases/tag/v5.0.9>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-41661) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_