CVE-2026-2578

Discovered by AISLEPUBLISHEDCWE-201

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

CVSS Base Scores

CVSS v3.1(Primary)
4.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected Products

VendorProductVersionStatus
MattermostMattermost11.3.0affected
MattermostMattermost11.4.0unaffected
MattermostMattermost11.3.1—

Credits

  • Joshua Rogers(finder)

Solutions

Update Mattermost to versions 11.4.0, 11.3.1 or higher.

References