Security Advisory

CVE-2026-5139

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-22 13:34:21

Last updated 2026-06-22 15:39:29

Assigner Mattermost

CVSS score 5.4

State PUBLISHED

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

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