{"id":"CVE-2021-21358","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-21358","generatedAt":"2026-10-28T01:53:39.781Z","title":"In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting.","description":"TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.","published":"2021-03-23T02:15:13.000Z","lastModified":"2026-06-17T03:35:23.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","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"},"cwe":["CWE-79"],"affected":["typo3/typo3"],"epss":{"score":0.00872,"percentile":0.58602,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.87%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://packagist.org/packages/typo3/cms-form","tags":["Release Notes","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://typo3.org/security/advisory/typo3-core-sa-2021-004","tags":["Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://packagist.org/packages/typo3/cms-form","tags":["Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://typo3.org/security/advisory/typo3-core-sa-2021-004","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21358","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}