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
Advisories
No advisories yet.
Fixes
Solution
Update Mattermost Desktop App to versions 6.3.0, 6.2.3.0 or higher.
Workaround
No workaround given by the vendor.
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Thu, 17 Sep 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Thu, 17 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 | |
| Title | Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler | |
| Weaknesses | CWE-346 | |
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-09-17T19:18:45.112Z
Reserved: 2026-06-15T14:05:20.532Z
Link: CVE-2026-12284
No data.
Status : Received
Published: 2026-09-17T16:17:21.993
Modified: 2026-09-17T20:16:49.053
Link: CVE-2026-12284
No data.
OpenCVE Enrichment
Updated: 2026-09-17T19:30:06Z
Weaknesses