CVE-2026-12284
Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
- State
- Published
- Severity
- 3.8 Low
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jun 15, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.8 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | Mattermost |
Weaknesses
- CWE-346 Origin Validation Error
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2026-00699vendor-advisory
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