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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-3115

Guest users can view group member IDs without respecting view restrictions

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594

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

  • 11.2.0 to ≤ 11.2.2affected
  • 10.11.0 to ≤ 10.11.10affected
  • 11.4.0 to ≤ 11.4.0affected
  • 11.3.0 to ≤ 11.3.1affected
  • 11.5.0unaffected
  • 11.2.3unaffected
  • 10.11.11unaffected
  • 11.4.1unaffected
  • 11.3.2unaffected

References