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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-28732

Slash command trigger-word update allowed command hijacking

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597

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

  • 11.5.0 to ≤ 11.5.1affected
  • 10.11.0 to ≤ 10.11.13affected
  • 11.4.0 to ≤ 11.4.3affected
  • 11.6.0unaffected
  • 11.5.2unaffected
  • 10.11.14unaffected
  • 11.4.4unaffected

References