GitHub Advisoryadvisory · Go

GHSA-6cfr-wp44-6qmv Mattermost has an Incorrect Authorization issue

MEDIUM Published 2026-05-21 Modified 2026-06-23 Official page ↗
Aliases
CVE-2026-4055
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-863
Reviewed
2026-06-23

Affected packages

• Go github.com/mattermost/mattermost/server/v8: >= 8.0.0-20260304132957-9f2616376582, < 8.0.0-20260320113102-f2b3d1c6a945 → fixed in 8.0.0-20260320113102-f2b3d1c6a945

Description

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629.

Related

Alias · CVE (1)

  • CVE-2026-4055 Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run… vulnerability

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References