---
cve: "CVE-2026-56728"
severity: "MEDIUM"
cvss: 5.3
epss: "0.3%"
vendor: "Zammad"
kev: false
exploited: false
published: "2026-09-25 18:17:26"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T11:12:30+02:00"
---

# CVE-2026-56728

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, a broken access control vulnerability exists in Zammad's GraphQL API. An authenticated user can access taskbar item data belonging to another user by crafting a request with the target user's taskbar identifier. The taskbar feature stores transient state for active user sessions, including auto-saved ticket drafts. Under certain conditions, the authorization check for taskbar item access is not enforced, allowing a user to read another user's taskbar item data. This vulnerability is fixed in 7.0.2.

## 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:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- 4ccd5d573023b66b0d0184914c92417e1780793f (Commit)
- 9dc15acf239dbc32ec357708859f2d86b188846c (Commit)

## BSI-Hinweise (deutsch)

- [Zammad: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1981)

## Referenzen

- <https://github.com/zammad/zammad/security/advisories/GHSA-jvcg-5539-vvc3>
- <https://github.com/zammad/zammad/commit/4ccd5d573023b66b0d0184914c92417e1780793f>
- <https://github.com/zammad/zammad/releases/tag/7.0.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56728) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_