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MEDIUM 4.3 Go

Mattermost fails to preserve the redacted state of burn-on-read posts during deletion

GHSA-3rhr-jr63-hwq5 · CVE-2026-2578 · GO-2026-4734

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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

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