GHSA-3rhr-jr63-hwq5MediumCVSS 4.3

Mattermost fails to preserve the redacted state of burn-on-read posts during deletion

Published
March 16, 2026
Last Modified
March 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-2578 →

📋 Description

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event. Mattermost Advisory ID: MMSA-2026-00579

🎯 Affected products5

  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20260127062706-c6b205f0d770
  • go/github.com/mattermost/mattermost-server:< 5.3.2-0.20260127062706-c6b205f0d770
  • 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)