GHSA-679f-wmrg-qf57MediumCVSS 4.3

Mattermost allows a removed team member to enumerate all public channels within a private team

Published
March 16, 2026
Last Modified
March 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-2458 →

📋 Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint. Mattermost Advisory ID: MMSA-2025-00568

🎯 Affected products5

  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20260113182106-a18b80ba4c32
  • go/github.com/mattermost/mattermost-server:< 5.3.2-0.20260113182106-a18b80ba4c32
  • 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)