{"id":"CVE-2021-43558","aliases":["BIT-moodle-2021-43558","GHSA-wpfp-q843-v772"],"url":"https://o3.security/vulnerability/CVE-2021-43558","summary":"Cross-site Scripting in moodle","details":"A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.","published":"2021-11-22T16:15:08.237Z","modified":"2026-07-08T06:00:04.602166040Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00845,"percentile":0.54874,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.11.4"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.10.8"},{"ecosystem":"Packagist","name":"moodle/moodle","fixedVersion":"3.9.11"}],"fix":null,"references":[{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2021515"},{"type":"FIX","url":"https://moodle.org/mod/forum/discuss.php?d=429097"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:00:04.602166040Z"}}