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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-5139

GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration

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Status
Published
Published
Updated
Assigning organization
Mattermost

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 11.7.0 to ≤ 11.7.0affected
  • 11.6.0 to ≤ 11.6.2affected
  • 11.5.0 to ≤ 11.5.5affected
  • 10.11.0 to ≤ 10.11.17affected
  • 11.8.0unaffected
  • 11.7.1unaffected
  • 11.6.3unaffected
  • 11.5.6unaffected
  • 10.11.18unaffected

References