CVE-2026-12284 — Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
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…
Published: 2026-09-17 · CVSS: 3.8 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7