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
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | ≤ 1.1.4 | 1.1.5 |
Advisories 1
- WID-SEC-2026-0625 Mattermost-Plugin "Legal Hold": Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Apr 7, 2026
References
- MMSA-2026-00621 vendor-advisory