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CVE PROGRAM SOURCE RECORD3.8 Low

CVE-2026-26230

Team Admin Privilege Escalation to Demote Members to Guest

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531

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 ≤ 10.11.10affected
  • 11.4.0unaffected
  • 10.11.11unaffected

References