{"id":"CVE-2026-12284","summary":"Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler","details":"Mattermost Desktop App versions \u003c=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","modified":"2026-10-15T02:47:35.370800446Z","published":"2026-09-17T15:11:52.297Z","database_specific":{"cna_assigner":"Mattermost","cwe_ids":["CWE-346"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12284.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"last_affected":"6.2.2"}]}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12284.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12284"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/desktop","events":[{"introduced":"200c274b361a2dcb7d7e8208adc44bdcd4645616"},{"fixed":"99b6258eda51936ee4004a4e0175db06d65cc106"}],"database_specific":{"cpe":"cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"6.2.0"},{"fixed":"6.2.3"}],"source":"CPE_RANGE"}}],"versions":["v6.2.3-rc.2","v6.2.3-rc.1","v6.2.2-mas.1","v6.2.2","v6.2.2-rc.1","v6.2.1-mas.2","v6.2.1","v6.2.1-mas.1","v6.2.1-rc.1","v6.2.0-mas.1","v6.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12284.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}