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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-3433

Mattermost fails to scope role_updated websocket events to authorized team and channel members

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616

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

  • 11.6.0 to ≤ 11.6.1affected
  • 11.5.0 to ≤ 11.5.4affected
  • 10.11.0 to ≤ 10.11.15affected
  • 10.11.0 to ≤ 10.11.16affected
  • 11.7.0unaffected
  • 11.6.2unaffected
  • 11.5.5unaffected
  • 10.11.16unaffected
  • 10.11.17unaffected

References