Description
Mattermost Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash the user's application by sending the user a malformed URL.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | ≤ 5.13.0 | 5.13.1 |
Advisories 1
- WID-SEC-2025-2056 Mattermost Desktop: Schwachstellen ermöglichten Denial of Service BSI CERT-Bund (WID) · Nov 17, 2025