---
cve: "CVE-2026-5308"
severity: "MEDIUM"
cvss: 4.9
epss: "25%"
vendor: "Mattermost"
kev: false
exploited: false
published: "2026-05-22 11:16:23"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T17:34:50+02:00"
---

# CVE-2026-5308

> 4.9 MEDIUM

## Beschreibung

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- f6760151c4a7b4b9d0807fa18892aaf24a3e190e (Commit)
- 292d4b7ea15b49a29989129758f25be37aec946e (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-5308) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_