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CVE PROGRAM SOURCE RECORD3.1 Low

CVE-2026-20796

Time-of-check time-of-use vulnerability in common teams API

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

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

  • 10.11.0 to ≤ 10.11.9affected
  • 11.3.0unaffected
  • 10.11.10unaffected

References