Description
Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | ≤ 6.2.2 | 6.3.0 |
Advisories 1
- WID-SEC-2026-2876 Mattermost Desktop: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
References
- MMSA-2026-00699 vendor-advisory