{"action":"Upgrade typo3/cms to 9.5.25 or later.","affected":[{"fixed":"10.4.14","introduced":"10.0.0"},{"fixed":"11.1.1","introduced":"11.0.0"},{"fixed":"9.5.25","introduced":"9.0.0"}],"component":"typo3/cms","cve_ids":["CVE-2021-21338"],"ecosystem":"Packagist","epss":0.01104,"exploited":false,"fixed_versions":["10.4.14","11.1.1","9.5.25"],"ghsa_id":"GHSA-4jhw-2p6j-5wmp","id":"tcs_01M5KEV30S8K7XVN7QEAF0D076","modified_at":"2026-07-08T06:28:43.727005678Z","published_at":"2021-03-23T01:53:35Z","references":["https://osv.dev/vulnerability/GHSA-4jhw-2p6j-5wmp","https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp","https://nvd.nist.gov/vuln/detail/CVE-2021-21338","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21338.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21338.yaml","https://packagist.org/packages/typo3/cms-core","https://typo3.org/security/advisory/typo3-core-sa-2021-001"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-4jhw-2p6j-5wmp#Packagist/typo3/cms","url":"https://osv.dev/vulnerability/GHSA-4jhw-2p6j-5wmp"}],"summary":"Open Redirection in Login Handling"}