CVE-2026-9602

Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods

Published Jul 17, 2026 CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
Description
Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678

Remediation

Vendor Solution

Update Mattermost Desktop App to versions 6.3.0, 6.2.1.0, 5.13.7.0 or higher.

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Description Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678
Title Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Jul 17, 2026, 12:54 PM
Reserved
May 26, 2026, 3:42 PM
Status
Analyzed
Published
Jul 17, 2026, 11:17 AM
Modified
Oct 15, 2026, 1:32 PM