Mattermost Desktop App <=6.2 Crash via Malformed Payload in Web App
CVE-2026-9602 Published on July 17, 2026
Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods
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
Vulnerability Analysis
CVE-2026-9602 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-9602 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-9602
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Affected Versions
Mattermost:- Before and including 6.0.2 is affected.
- Before and including 5.6.13 is affected.
- Version 6.3.0 is unaffected.
- Version 6.2.1.0 is unaffected.
- Version 5.13.7.0 is unaffected.