{"id":"CVE-2021-36399","aliases":["BIT-moodle-2021-36399","GHSA-79jp-m64f-pgrc"],"url":"https://o3.security/vulnerability/CVE-2021-36399","summary":"Moodle Cross-site Scripting vulnerability","details":"In Moodle, ID numbers displayed in the quiz override screens required additional sanitizing to prevent a stored XSS risk.","published":"2023-03-06T22:15:09.477Z","modified":"2026-07-09T06:01:53.871663Z","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":0,"affectedPackages":[{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.11.1"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.10.5"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.9.8"}],"fix":null,"references":[{"type":"FIX","url":"https://moodle.org/mod/forum/discuss.php?d=424805"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T06:01:53.871663Z"}}