🛡️ CVE-2026-5308
🟡 CVSS 4.9 — Medium ✅ No Known Exploit CWE-400 NVD
4.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Details

Severity MEDIUM
CVSS Score 4.9
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE CWE-400
Public Exploit ✅ No
Source NVD
Published 2026-05-22
Updated 2026-06-02
Modified 2026-05-22
Fix URL N/A

Affected Packages

Software From version Fixed in
mattermost-server 11.6.0 11.6.1

References

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