---
cve: "CVE-2026-6062"
severity: "MEDIUM"
cvss: 6.4
epss: "24%"
vendor: "Mattermost"
kev: false
exploited: false
published: "2026-06-22 14:17:51"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T21:35:21+02:00"
---

# CVE-2026-6062

> 6.4 MEDIUM

## Beschreibung

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 79ba3d3d83ef1562d08ffd2d29d3d9cc2636a41c (Commit)
- 16c42cd8677fcc91383da3b0cc85b8c9c0c231c3 (Commit)

## Referenzen

- <https://mattermost.com/security-updates>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-6062) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_