GHSA-m5rv-56xx-hfc6HighCVSS 7.5

Mattermost fails to properly handle very long passwords

Published
March 16, 2026
Last Modified
March 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-24458 →

📋 Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587

🎯 Affected products5

  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20260129164748-7201f42d955f
  • go/github.com/mattermost/mattermost-server:< 5.3.2-0.20260129164748-7201f42d955f
  • go/github.com/mattermost/mattermost-server:>= 10.11.0-rc1, < 10.11.11
  • go/github.com/mattermost/mattermost-server:>= 11.2.0-rc1, < 11.2.3
  • go/github.com/mattermost/mattermost-server:>= 11.3.0-rc1, < 11.3.1

🔗 References (4)