CVE-2026-3524 | THREATINT

Description

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

PUBLISHED Reserved 2026-03-04 | Published 2026-04-06 | Updated 2026-04-07 | Assigner Mattermost

HIGH: 8.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-862: Missing Authorization

Product status

Default status

unaffected

Any version

affected

1.1.5

unaffected

Credits

Hassan Mohammed finder

References

mattermost.com/security-updates (MMSA-2026-00621) vendor-advisory

cve.org (CVE-2026-3524)

nvd.nist.gov (CVE-2026-3524)

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