CVE-2026-9602

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

Published: Jul 17, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-400

6.5MEDIUM

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

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-400

Affected Products

Mattermost

commercial·US

mattermost desktopOn-premDesktop App

Communications / messaging-chat

MattermostOn-premWeb App

Communications / messaging-chat

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://mattermost.com/security-updates

mattermost.com

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