Vulnerability Details CVE-2026-2578
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
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.2%
CVSS Severity
CVSS v3 Score 4.3
References
Products affected by CVE-2026-2578
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cpe:2.3:a:mattermost:mattermost_server:11.3.0