CVE-2026-12284
Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler
CVSS Score
3.8
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-346 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Sep 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Mattermost / Mattermost
0 ≤ 6.2.2
Credits
Juho Forsén