{"id":"CVE-2026-93848","aliases":[],"title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","titleSource":"Mattermost","descriptionSource":"Mattermost","products":[{"vendor":"Mattermost","name":"Mattermost","platforms":[],"versions":[{"version":"11.7.0","status":"affected","lessThanOrEqual":"11.7.10","versionType":"semver"},{"version":"11.11.0","status":"unaffected"},{"version":"11.7.11","status":"unaffected"}],"defaultStatus":"unaffected","source":"Mattermost","url":"https://www.cve.org/CVERecord?id=CVE-2026-93848"}],"remediation":[{"text":"Update Mattermost to versions 11.11.0, 11.7.11 or higher.","source":"Mattermost","url":"https://www.cve.org/CVERecord?id=CVE-2026-93848"}],"description":"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 the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774","severity":"low","score":2.7,"published":"2026-10-26T14:28:23.565Z","modified":"2026-10-26T16:46:45.446Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://mattermost.com/security-updates"],"sources":[{"name":"CVE","id":"CVE-2026-93848","modified":"2026-10-26T16:46:45.446Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-93848"}],"assessments":[{"source":"Mattermost","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","score":2.7}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T03:15:31.428Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}