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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-10106

Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690

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 ≤ 11.7.2affected
  • 11.6.0 to ≤ 11.6.4affected
  • 10.11.0 to ≤ 10.11.19affected
  • 11.8.0unaffected
  • 11.7.3unaffected
  • 11.6.5unaffected
  • 10.11.20unaffected

References