CVE-2026-2578 — Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts

CVE-2026-2578

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 11.3.0 through 11.3.0; unaffected 11.4.0; unaffected 11.3.1

CWE

CWE-201

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.