{"id":"CVE-2026-3116","aliases":["EUVD-2026-16246","GHSA-f499-j7p4-wm44"],"status":"published","title":"Improper Input Validation in Zoom Plugin Webhook Handler","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","severity":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00357,"percentile":0.29841,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2026-03-26T16:19:32Z","modified":"2026-11-07T02:48:27Z","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-2026-3116","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f499-j7p4-wm44"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3116.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-3116","title":"Improper Input Validation in Zoom Plugin Webhook Handler","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","status":"published","published":"2026-03-26T16:19:32.607Z","modified":"2026-03-26T17:51:14.971Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T13:49:09.229322Z"}],"euvd":[{"id":"EUVD-2026-16246","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","status":"published","published":"2026-03-26T16:19:32Z","modified":"2026-03-26T17:51:14Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T19:25:28.18595Z"}],"ghsa":[{"id":"GHSA-f499-j7p4-wm44","title":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming...","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","status":"published","published":"2026-03-26T18:31:42Z","modified":"2026-03-26T18:31:49Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:06:53.526079Z"}],"nvd":[{"id":"CVE-2026-3116","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","status":"published","published":"2026-03-26T17:16:42.823Z","modified":"2026-06-17T10:43:04.347Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:12:11.678711Z"}],"osv":[{"id":"CVE-2026-3116","title":"Improper Input Validation in Zoom Plugin Webhook Handler","description":"Mattermost Plugins versions \u003c=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589","status":"published","published":"2026-03-26T16:19:32.607Z","modified":"2026-11-07T02:48:27.573173767Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-07T03:08:03.648449Z"}]}}