{"id":"CVE-2021-20183","aliases":["BIT-moodle-2021-20183","GHSA-xhfx-rm8q-c3xv"],"url":"https://o3.security/vulnerability/CVE-2021-20183","summary":"Moodle Vulnerable to Reflected Cross-site Scripting","details":"It was found in Moodle before version 3.10.1 that some search inputs were vulnerable to reflected XSS due to insufficient escaping of search queries.","published":"2021-01-28T19:15:13.160Z","modified":"2026-07-08T22:14:55.456473Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"},"epss":{"score":0.00816,"percentile":0.53967,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"4.0.0-beta"}],"fix":null,"references":[{"type":"FIX","url":"https://moodle.org/mod/forum/discuss.php?d=417166"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T22:14:55.456473Z"}}