GitHub Advisoryadvisory · Go

GHSA-679f-wmrg-qf57 Mattermost allows a removed team member to enumerate all public channels within a private team

MEDIUM Published 2026-03-16 Modified 2026-03-17 Official page ↗
Aliases
CVE-2026-2458
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-862
Reviewed
2026-03-17

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20260113182106-a18b80ba4c32 → fixed in 8.0.0-20260113182106-a18b80ba4c32 • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20260113182106-a18b80ba4c32 → fixed in 5.3.2-0.20260113182106-a18b80ba4c32 • Go github.com/mattermost/mattermost-server: >= 10.11.0-rc1, < 10.11.11 → fixed in 10.11.11 • Go github.com/mattermost/mattermost-server: >= 11.2.0-rc1, < 11.2.3 → fixed in 11.2.3 • Go github.com/mattermost/mattermost-server: >= 11.3.0-rc1, < 11.3.1 → fixed in 11.3.1

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

Related

Alias · CVE (1)

  • CVE-2026-2458 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… vulnerability

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References