---
cve: "CVE-2026-66399"
severity: "HIGH"
cvss: 8.5
epss: "23%"
vendor: "thorsten"
kev: false
exploited: false
published: "2026-07-27 15:43:48"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T05:43:39+02:00"
---

# CVE-2026-66399

> 8.5 HIGH · 🧪 PoC

## Beschreibung

phpMyFAQ before 4.1.6 contains a privilege escalation vulnerability in GroupController::updateMembers() that allows administrators with only group-management permissions to join privileged groups without verification of required rights. Attackers can add themselves to pre-existing groups holding user-management rights and immediately inherit those permissions to modify or delete user accounts.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 58c1d7f2fa36f7074664fc6d862afee0ca8bcc89 (Commit)

## Referenzen

- <https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-28cc-v39j-vr95>
- <https://www.vulncheck.com/advisories/phpmyfaq-before-privilege-escalation-via-group-membership>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66399) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_