{"id":"CVE-2026-9602","title":"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 me…","summary":"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 me…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"vendor":"mattermost","product":"mattermost_desktop","affected":["mattermost_desktop < 5.13.7","mattermost_desktop >= 6.0.0, <= 6.0.2","mattermost_desktop >= 6.2.0, < 6.2.1"],"patched":["mattermost_desktop 6.2.1"],"published":"2026-07-17","updated":"2026-10-15","sourceUpdated":"2026-10-15T13:32:07.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-9602","references":[{"url":"https://mattermost.com/security-updates","label":"responsibledisclosure@mattermost.com"}],"tags":["nvd"],"epss":0.0042,"epssPercentile":0.3473,"ingestedAt":"2026-10-15T14:07:30.098Z","slug":"CVE-2026-9602","body":"## Overview\n\nMattermost 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\n\n## Affected\n\n- `mattermost_desktop < 5.13.7`\n- `mattermost_desktop >= 6.0.0, <= 6.0.2`\n- `mattermost_desktop >= 6.2.0, < 6.2.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mattermost_desktop 6.2.1`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}