CVE-2026-12284
Low
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
SeverityLow
CVSS3.7
Exploit probability—
Product
Mattermost Desktop
PublishedSep 17, 2026
First seenSep 17, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- mattermost mattermost_desktop6.2.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_desktop | 6.2.0 ≤ v < 6.2.3 | 6.2.3 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.