{"id":"CVE-2020-26227","aliases":["BIT-typo3-2020-26227","GHSA-vqqx-jw6p-q3rf"],"url":"https://o3.security/vulnerability/CVE-2020-26227","summary":"Cross-Site Scripting in Fluid view helpers","details":"> ### Meta\n> * CVSS: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C` (5.7)\n> * CWE-79\n\n### Problem\nIt has been discovered that system extension Fluid (`typo3/cms-fluid`) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers.\n\n```\n<f:form ... fieldNamePrefix=\"{payload}\" />\n<f:be.labels.csh ... label=\"{payload}\" />\n<f:be.menus.actionMenu ... label=\"{payload}\" />\n```\n\n### Solution\nUpdate to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.\n\n### Credits\nThanks to TYPO3 security team member Oliver Hader who reported this issue and to TYPO3 security team members Helmut Hummel & Oliver Hader who fixed the issue.\n\n### References\n* [TYPO3-CORE-SA-2020-010](https://typo3.org/security/advisory/typo3-core-sa-2020-010)","published":"2020-11-23T21:15:12.047Z","modified":"2026-08-27T03:48:38.710601951Z","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":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"9.5.23"},{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"10.4.10"},{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"8.7.38"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"10.4.10"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"9.5.23"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"8.7.38"}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-vqqx-jw6p-q3rf"},{"type":"EVIDENCE","url":"https://typo3.org/security/advisory/typo3-core-sa-2020-010"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26227"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-26227.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-26227.yaml"},{"type":"WEB","url":"https://packagist.org/packages/typo3/cms-core"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:48:38.710601951Z"}}