GHSA-ph22-fw5m-w2q9MediumCVSS 4.3

Mattermost allows attackers to spoof permalink embeds

Published
March 16, 2026
Last Modified
March 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-2457 →

📋 Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint. Mattermost Advisory ID: MMSA-2025-00569

🎯 Affected products5

  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20260123211116-9efe617be8b8
  • go/github.com/mattermost/mattermost-server:< 5.3.2-0.20260123211116-9efe617be8b8
  • 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)