GHSA-3rhr-jr63-hwq5

ghsaUSosv

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

view advisory published 2026-03-16Licence: CC-BY-4.0

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

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-2578US	—	0.23% (13th)	—	2026-03-16
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 messag…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermostPACKAGE
https://github.com/mattermost/mattermost/commit/c6b205f0d77080ef805783de0628b9526af7faecWEB
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-2578ADVISORY

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