{"id":"CVE-2026-93848","title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","summary":"Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from …","severity":"low","cvss":2.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-918"],"vendor":"Mattermost","product":"Mattermost","affected":["Mattermost >= 11.7.0 <= 11.7.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-26T15:34:04.498238Z"},"published":"2026-10-26","updated":"2026-10-26","sourceUpdated":"2026-10-26T16:46:45.446Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93848","references":[{"url":"https://mattermost.com/security-updates","label":"MMSA-2026-00774"}],"tags":["cve.org"],"ingestedAt":"2026-10-26T15:29:30.534Z","slug":"CVE-2026-93848","body":"## Overview\n\nMattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774\n\n## Affected\n\n- `Mattermost >= 11.7.0 <= 11.7.10`\n\n## Remediation\n\nUpdate Mattermost to versions 11.11.0, 11.7.11 or higher.","depth":"sunlit","depthScore":15,"depthScoreParts":{"impact":14.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}