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
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Tue, 13 Oct 2026 12:15:00 +0000
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| First Time appeared |
Mattermost mattermost Desktop
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| CPEs | cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost mattermost Desktop
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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 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-09-17T15:11:52.297Z
Updated: 2026-09-17T19:18:45.112Z
Reserved: 2026-06-15T14:05:20.532Z
Link: CVE-2026-12284
No data.
Status : Analyzed
Published: 2026-09-17T16:17:21.993
Modified: 2026-10-13T12:04:25.870
Link: CVE-2026-12284
No data.