{"id":"CVE-2026-12284","title":"Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an …","summary":"Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an …","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-346"],"vendor":"mattermost","product":"mattermost_desktop","affected":["mattermost_desktop >= 6.2.0, < 6.2.3"],"patched":["mattermost_desktop 6.2.3"],"published":"2026-09-17","updated":"2026-10-13","sourceUpdated":"2026-10-13T12:04:25.870","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-12284","references":[{"url":"https://mattermost.com/security-updates","label":"responsibledisclosure@mattermost.com"}],"tags":["nvd","cve.org"],"epss":0.00164,"epssPercentile":0.05549,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T19:18:33.462460Z"},"scores":{"nvd":3.7,"cna":3.8},"ingestedAt":"2026-09-17T16:21:47.707Z","slug":"CVE-2026-12284","body":"## Overview\n\nMattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699\n\n## Affected\n\n- `mattermost_desktop >= 6.2.0, < 6.2.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `mattermost_desktop 6.2.3`","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}