---
cve: "CVE-2026-34720"
severity: "LOW"
cvss: 2.3
epss: "0.1%"
vendor: "Zammad"
kev: false
exploited: false
published: "2026-04-08 19:25:22"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T13:29:15+02:00"
---

# CVE-2026-34720

> 2.3 LOW · 🧪 PoC

## Beschreibung

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 15c7e6d4ffd95c84535d334b7c0ce0bc2fbc5228 (Commit)

## BSI-Hinweise (deutsch)

- [Zammad: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1000)

## Referenzen

- <https://github.com/zammad/zammad/security/advisories/GHSA-hcv6-w4h9-p2p7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34720) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_