VULNERABILITY INTELLIGENCE

CVE-2026-2578

CVSS score4.3 MEDIUM
EPSS probability0.23%
CISA KEVNot currently listed
Published2026-03-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-201

Primary references