Unrated severityNVD Advisory· Published Jun 22, 2026· Updated Jun 22, 2026
GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration
CVE-2026-5139
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 }} slash command.. Mattermost Advisory ID: MMSA-2026-00644
AI Insight
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Affected products
1- Range: <=11.7.0, <=11.6.2, <=11.5.5, <=10.11.17
Patches
Vulnerability mechanics
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References
1- mattermost.com/security-updatesmitrevendor-advisory
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