CVE-2026-2578 | THREATINT

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

PUBLISHED Reserved 2026-02-16 | Published 2026-03-16 | Updated 2026-03-16 | Assigner Mattermost

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-201: Insertion of Sensitive Information Into Sent Data

Product status

Default status

unaffected

11.3.0 (semver)

affected

11.4.0

unaffected

11.3.1

unaffected

Credits

Joshua Rogers finder

References

mattermost.com/security-updates (MMSA-2026-00579) vendor-advisory

cve.org (CVE-2026-2578)

nvd.nist.gov (CVE-2026-2578)

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