GHSA-jmvr-r5hm-fxfrHighCVSS 7.5

Mattermost doesn't enforce request body size limits on plugin HTTP endpoints

Published
May 26, 2026
Last Modified
June 29, 2026

🔗 CVE IDs covered (1)

CVE-2026-5308 →

📋 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

🎯 Affected products5

  • go/github.com/mattermost/mattermost-server:= 11.6.0
  • go/github.com/mattermost/mattermost-server:>= 11.5.0, < 11.5.4
  • go/github.com/mattermost/mattermost-server:>= 11.4.0, < 11.4.5
  • go/github.com/mattermost/mattermost-server:>= 10.11.0, < 10.11.15
  • go/github.com/mattermost/mattermost-plugin-github:< 1.0.1-0.20260410143745-9b41b1fd43c4

🔗 References (4)