CVE-2026-9602
Medium
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
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mattermost Desktop
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- mattermost mattermost_desktop5.13.7, 6.2.1 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_desktop | v < 5.13.7, 6.0.0 ≤ v ≤ 6.0.2, 6.2.0 ≤ v < 6.2.1 | 5.13.7, 6.2.1 |
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