{"id":"CVE-2026-12284","aliases":["EUVD-2026-81680","GHSA-q4vh-9cg5-4q62"],"status":"published","title":"Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler","description":"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","severity":{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00164,"percentile":0.05665,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-346"],"published":"2026-09-17T15:11:52Z","modified":"2026-10-28T02:30:21Z","products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_desktop"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12284","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-q4vh-9cg5-4q62"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12284.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-12284","title":"Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler","description":"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","status":"published","published":"2026-09-17T15:11:52.297Z","modified":"2026-09-17T19:18:45.112Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:19:48.461833Z"}],"euvd":[{"id":"EUVD-2026-81680","description":"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","status":"published","published":"2026-09-17T15:11:52Z","modified":"2026-09-17T19:18:45Z","cvss":[{"version":"3.1","score":3.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T17:28:10.042182Z"}],"ghsa":[{"id":"GHSA-q4vh-9cg5-4q62","title":"Mattermost Desktop App versions \u003c=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall...","description":"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","status":"published","published":"2026-09-17T18:31:46Z","modified":"2026-09-17T18:32:00Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:12:06.546375Z"}],"nvd":[{"id":"CVE-2026-12284","description":"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","status":"published","published":"2026-09-17T16:17:21.993Z","modified":"2026-10-13T12:04:25.87Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:12:49.013904Z"}],"osv":[{"id":"CVE-2026-12284","title":"Mattermost Desktop App Missing IPC Sender Validation in Calls Leave Handler","description":"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","status":"published","published":"2026-09-17T15:11:52.297Z","modified":"2026-10-28T02:30:21.793559218Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:44:57.354194Z"}]}}