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Untriaged
Permalink CVE-2026-3115
4.3 MEDIUM
  • CVSS version: 3.1
  • Attack vector (AV): NETWORK
  • Attack complexity (AC): LOW
  • Privileges required (PR): LOW
  • User interaction (UI): NONE
  • Scope (S): UNCHANGED
  • Confidentiality impact (C): LOW
  • Integrity impact (I): NONE
  • Availability impact (A): NONE
created 2 weeks, 5 days ago
Guest users can view group member IDs without respecting view restrictions

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

References

Affected products

Mattermost
  • =<11.2.2
  • =<10.11.10
  • =<11.3.1
  • ==11.5.0
  • =<11.4.0
  • ==10.11.11
  • ==11.4.1
  • ==11.2.3
  • ==11.3.2

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