{"id":"CVE-2021-20280","aliases":["BIT-moodle-2021-20280","GHSA-x2jp-hh65-4xvf"],"url":"https://o3.security/vulnerability/CVE-2021-20280","summary":"Cross-site scripting (XSS) and Server side request forgery (SSRF) in moodle","details":"Text-based feedback answers required additional sanitizing to prevent stored XSS and blind SSRF risks in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.","published":"2021-03-15T22:15:13.203Z","modified":"2026-07-08T06:00:31.790029655Z","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":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.10.2"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.9.5"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.8.8"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.5.17"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGOMHMYM3WICJ6D6U22Z6LPJGT5A6MZM/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1939037"},{"type":"FIX","url":"https://moodle.org/mod/forum/discuss.php?d=419651"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/164817/Moodle-Cross-Site-Scripting-Server-Side-Request-Forgery.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:00:31.790029655Z"}}