Vulnerability DatabaseCVE-2026-9602
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CVE-2026-9602
Published:July 17, 2026
Updated:August 04, 2026
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
Affected Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v5.5.0 <v5.13.7
Fix Suggestion:
Update to version v5.13.7
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.2.1
Fix Suggestion:
Update to version v6.2.1
Related Resources (3)
https://mattermost.com/security-updates
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9602.json
https://nvd.nist.gov/vuln/detail/CVE-2026-9602
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400
EPSS
Base Score:
0.24