PT-2026-25701 · Mattermost · Mattermost

Joshua Rogers · Published 2026-03-16 · Updated 2026-03-16 · CVE-2026-2578

NVD

CVSS v3.1

4.3

4.3

Medium

Base vector

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

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

Fix

Weakness Enumeration

CWE-201

Related Identifiers

CVE-2026-2578

Affected Products

Mattermost

References · 3

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2578 · Security Note
• https://twitter.com/CVEnew/status/2033583649841680773 · Twitter Post