CVE-2026-3524 — Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check

CVE-2026-3524

Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 1.1.4; unaffected 1.1.5

CWE

CWE-862

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.