Vulnerability DatabaseCVE-2026-12284
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CVE-2026-12284
Published:September 17, 2026
Updated:September 22, 2026
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
Affected Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=autoupdater__nightly-deploy_5.1.0-nightly.20220217 <v6.2.3
Fix Suggestion:
Update to version v6.2.3
Related Resources (1)
https://mattermost.com/security-updates
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Origin Validation Error
CWE-346
EPSS
Base Score:
0.13