{"id":"CVE-2021-21370","aliases":["BIT-typo3-2021-21370","GHSA-x7hc-x7fm-f7qh"],"url":"https://o3.security/vulnerability/CVE-2021-21370","summary":"Cross-Site Scripting in Content Preview (CType menu)","details":"TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.","published":"2021-03-23T02:15:12.987Z","modified":"2026-08-27T03:49:17.873858487Z","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":null,"affectedPackages":[{"ecosystem":"Packagist","name":"typo3/cms-backend","fixedVersion":"7.6.51"},{"ecosystem":"Packagist","name":"typo3/cms-backend","fixedVersion":"8.7.40"},{"ecosystem":"Packagist","name":"typo3/cms-backend","fixedVersion":"9.5.25"},{"ecosystem":"Packagist","name":"typo3/cms-backend","fixedVersion":"10.4.14"},{"ecosystem":"Packagist","name":"typo3/cms-backend","fixedVersion":"11.1.1"},{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"10.4.14"},{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"11.1.1"},{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"9.5.25"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"10.4.14"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"11.1.1"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"9.5.25"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qh"},{"type":"ADVISORY","url":"https://packagist.org/packages/typo3/cms-backend"},{"type":"ADVISORY","url":"https://typo3.org/security/advisory/typo3-core-sa-2021-008"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:49:17.873858487Z"}}