{"id":"CVE-2020-9311","aliases":["BIT-silverstripe-2020-9311","GHSA-2pw2-qpcp-m47x"],"url":"https://o3.security/vulnerability/CVE-2020-9311","summary":"Silverstripe CMS XSS Vulnerability","details":"In SilverStripe through 4.5, malicious users with a valid Silverstripe CMS login (usually CMS access) can craft profile information which can lead to XSS for other users through specially crafted login form URLs.","published":"2020-07-15T21:15:13.817Z","modified":"2026-08-07T15:14:59.000121Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00556,"percentile":0.44698,"asOf":"2026-09-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"silverstripe/cms","fixedVersion":null},{"ecosystem":"Packagist","name":"silverstripe/framework","fixedVersion":"3.7.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.silverstripe.org/download/security-releases/CVE-2020-9311"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-9311"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2020-9311.yaml"},{"type":"PACKAGE","url":"https://github.com/silverstripe/silverstripe-cms"},{"type":"WEB","url":"https://www.silverstripe.org/download/security-releases/cve-2020-9311"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:14:59.000121Z"}}