{"id":"CVE-2021-36401","aliases":["BIT-moodle-2021-36401","GHSA-g6h6-4fp6-w33w"],"url":"https://o3.security/vulnerability/CVE-2021-36401","summary":"Moodle vulnerable to Stored Cross-site Scripting","details":"In Moodle, ID numbers exported in HTML data formats required additional sanitizing to prevent a local stored XSS risk.","published":"2023-03-06T22:15:09.620Z","modified":"2026-07-09T05:44:33.370945Z","cvss":{"score":4.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:A/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=424807"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T05:44:33.370945Z"}}