---
cve: "CVE-2026-34721"
severity: "MEDIUM"
cvss: 5.9
epss: "0.1%"
vendor: "Zammad"
kev: false
exploited: false
published: "2026-04-08 19:25:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-25T22:10:12+02:00"
---

# CVE-2026-34721

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 15c7e6d4ffd95c84535d334b7c0ce0bc2fbc5228 (Commit)

## Referenzen

- <https://github.com/zammad/zammad/security/advisories/GHSA-mfwp-hx66-626c>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34721) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_