{"id":"CVE-2021-41113","aliases":["BIT-typo3-2021-41113","GHSA-657m-v5vm-f6rw"],"url":"https://o3.security/vulnerability/CVE-2021-41113","summary":"Cross-Site-Request-Forgery in Backend","details":"> ### Meta\n> * CVSS: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C` (8.2)\n\n### Problem\nIt has been discovered that the new TYPO3 v11 feature that allows users to create and share [deep links in the backend user interface](https://typo3.org/article/typo3-version-112-escape-the-orbit#c12178) is vulnerable to cross-site-request-forgery.\n\nThe impact is the same as described in [TYPO3-CORE-SA-2020-006 (CVE-2020-11069)](https://typo3.org/security/advisory/typo3-core-sa-2020-006). However, it is not limited to the same site context and does not require the attacker to be authenticated. In a worst case scenario, the attacker could create a new admin user account to compromise the system.\n\nTo successfully carry out an attack, an attacker must trick his victim to access a compromised system. The victim must have an active session in the TYPO3 backend at that time.\n\nThe following [Same-Site cookie settings](https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/8.7.x/Feature-90351-ConfigureTYPO3-shippedCookiesWithSameSiteFlag.html) in _$GLOBALS[TYPO3_CONF_VARS][BE][cookieSameSite]_ are required for an attack to be successful:\n\n* _SameSite=_***strict***: malicious evil.**example.org** invoking TYPO3 application at good.**example.org**\n* _SameSite=_***lax*** or ***none***: malicious **evil.com** invoking TYPO3 application at **example.org**\n\n### Solution\nUpdate your instance to TYPO3 version 11.5.0 which addresses the problem described.\n\n### Credits\nThanks to Richie Lee who reported this issue and to TYPO3 core & security team members Benni Mack and Oliver Hader who fixed the issue.\n\n### References\n* [TYPO3-CORE-SA-2021-014](https://typo3.org/security/advisory/typo3-core-sa-2021-014)\n* [CVE-2020-11069](https://nvd.nist.gov/vuln/detail/CVE-2020-11069) reintroduced in TYPO3 v11.2.0","published":"2021-10-05T18:15:08.200Z","modified":"2026-08-27T08:14:45.984530Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"typo3/cms-core","fixedVersion":"11.5.0"},{"ecosystem":"Packagist","name":"typo3/cms","fixedVersion":"11.5.0"}],"fix":{"url":"https://github.com/TYPO3/typo3/commit/fa51999203c5e5d913ecae5ea843ccb2b95fa33f","label":"TYPO3/typo3@fa51999"},"references":[{"type":"ADVISORY","url":"https://github.com/TYPO3/typo3/security/advisories/GHSA-657m-v5vm-f6rw"},{"type":"ADVISORY","url":"https://typo3.org/security/advisory/typo3-core-sa-2020-006"},{"type":"FIX","url":"https://github.com/TYPO3/typo3/commit/fa51999203c5e5d913ecae5ea843ccb2b95fa33f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11069"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41113"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-41113.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-41113.yaml"},{"type":"PACKAGE","url":"https://github.com/TYPO3/typo3"},{"type":"WEB","url":"https://typo3.org/security/advisory/typo3-core-sa-2021-014"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:14:45.984530Z"}}