GitHub Advisoryadvisory · Go

GHSA-2g8v-grq3-hq2g Mattermost doesn't enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler

MEDIUM Published 2026-06-22 Modified 2026-09-15 Official page ↗
Aliases
CVE-2026-5139
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Weaknesses
CWE-862
Reviewed
2026-09-15

Affected packages

• Go github.com/mattermost/mattermost-server: >= 11.7.0, < 11.7.1 → fixed in 11.7.1 • Go github.com/mattermost/mattermost-server: >= 11.6.0, < 11.6.3 → fixed in 11.6.3 • Go github.com/mattermost/mattermost-server: >= 11.5.0, < 11.5.6 → fixed in 11.5.6 • Go github.com/mattermost/mattermost-server: >= 10.11.0, < 10.11.18 → fixed in 10.11.18

Description

Mattermost versions 11.7.x }} slash command.. Mattermost Advisory ID: MMSA-2026-00644

Related

Alias · CVE (1)

  • CVE-2026-5139 Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization… vulnerability

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References