CVEvulnerability

CVE-2026-5139

5.4 MEDIUM Published 2026-06-22 Modified 2026-06-23 Official page ↗
Status
Analyzed
Published
2026-06-22
Last modified
2026-06-23
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Weaknesses
CWE-862

Description

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 on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect <instance-name>}} slash command.. Mattermost Advisory ID: MMSA-2026-00644

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.18) • mattermost mattermost server (>= 11.5.0 < 11.5.6) • mattermost mattermost server (>= 11.6.0 < 11.6.3) • mattermost mattermost server (>= 11.7.0 < 11.7.1)

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References