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CVE PROGRAM SOURCE RECORD3.9 Low

CVE-2026-16044

Insufficient validation of guest board admin privileges on archive import

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privileges during board archive import which allows a board member to escalate a guest user to Board Admin via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00672

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

  • 11.7.0 to ≤ 11.7.6affected
  • 10.11.0 to ≤ 10.11.21affected
  • 11.9.0unaffected
  • 11.7.7unaffected
  • 10.11.22unaffected

References