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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-6341

Incomplete group locking implementation

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602

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

  • 0 to ≤ 11.1.5affected
  • 0 to ≤ 10.13.11affected
  • 0 to ≤ 11.3.4affected
  • 11.6.0unaffected
  • 11.5.2unaffected
  • 10.11.14unaffected
  • 11.4.4unaffected

References