Vulnerability Details CVE-2026-12284
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
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 2.4%
CVSS Severity
CVSS v3 Score 3.7
References
Products affected by CVE-2026-12284
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cpe:2.3:a:mattermost:mattermost_desktop:6.2.0