CVE-2026-2578
Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
Summary
Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
Original description
The description as published by the source.
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
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory mattermost.com
- advisory nvd.nist.gov