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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-2578

Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579

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

  • 11.3.0 to ≤ 11.3.0affected
  • 11.4.0unaffected
  • 11.3.1unaffected

References