CVE-2026-9602

MEDIUM

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

Title source: cna
STIX 2.1

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00678
https://mattermost.com/security-updates

Scores

CVSS v3 6.5
EPSS 0.0024
EPSS Percentile 15.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (6)
Mattermost/Mattermost < 5.6.13
Mattermost/Mattermost < 6.0.2
Mattermost/Mattermost 5.13.7.0
Mattermost/Mattermost 6.2.1.0
Mattermost/Mattermost 6.3.0
mattermost/mattermost_desktop 5.6.13 - 5.13.7
Published Jul 17, 2026
Tracked Since Jul 17, 2026