Is CVE-2026-9602 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-9602?

CVE-2026-9602 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-9602

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