{"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 4.0.0-beta that some search inputs were vulnerable to reflected Cross-site Scripting (XSS) due to insufficient escaping of search queries.","published":"2021-01-28T19:15:13.160Z","modified":"2026-10-24T10:30:34.330986649Z","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":{"url":"https://github.com/moodle/moodle/commit/dc9de7b0d487b73c23c221dc0b8b6e01654921f3","label":"moodle/moodle@dc9de7b"},"references":[{"type":"FIX","url":"https://moodle.org/mod/forum/discuss.php?d=417166"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20183"},{"type":"WEB","url":"https://github.com/moodle/moodle/commit/dc9de7b0d487b73c23c221dc0b8b6e01654921f3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:30:34.330986649Z"}}