Cloudanix VulnDB

CVE-2026-5139

Medium · 5.4

CVSS

5.4

EPSS

0.3%

Published

Jun 22, 2026

CISA due date

—

The record

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 packages

Ecosystem Package Introduced Fixed

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