CVE-2026-12284 — Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler

CVE-2026-12284

Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 6.2.2; unaffected 6.3.0; unaffected 6.2.3.0

CWE

CWE-346

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.