{"id":"CVE-2026-3109","aliases":["EUVD-2026-16236","GHSA-pv8w-wmj3-q39p"],"status":"published","title":"Missing timestamp validation in Zoom webhook handler","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","severity":{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00302,"percentile":0.23233,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-754"],"published":"2026-03-26T16:28:07Z","modified":"2026-10-28T02:30:34Z","products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3109","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-pv8w-wmj3-q39p"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3109.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-3109","title":"Missing timestamp validation in Zoom webhook handler","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","status":"published","published":"2026-03-26T16:28:07.362Z","modified":"2026-03-26T19:52:11.107Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T13:49:09.229322Z"}],"euvd":[{"id":"EUVD-2026-16236","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","status":"published","published":"2026-03-26T16:28:07Z","modified":"2026-03-26T19:52:11Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T19:25:27.67679Z"}],"ghsa":[{"id":"GHSA-pv8w-wmj3-q39p","title":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which...","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","status":"published","published":"2026-03-26T18:31:42Z","modified":"2026-03-26T18:31:49Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T15:06:52.998793Z"}],"nvd":[{"id":"CVE-2026-3109","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","status":"published","published":"2026-03-26T17:16:41.967Z","modified":"2026-06-17T10:43:03.587Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:12:11.678711Z"}],"osv":[{"id":"CVE-2026-3109","title":"Missing timestamp validation in Zoom webhook handler","description":"Mattermost Plugins versions \u003c=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584","status":"published","published":"2026-03-26T16:28:07.362Z","modified":"2026-10-28T02:30:34.903911535Z","cvss":[{"version":"3.1","score":2.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T15:45:00.861953Z"}]}}