{"cve":{"cve_id":"CVE-2021-21338","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01104,"epss_percentile":0.61478,"epss_as_of":"2026-06-23","description":"TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.","published_at":"2021-03-23T01:45:14Z","last_modified_at":null,"cvss_v3_score":4.7,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-601"],"nvd_references":["https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp","https://packagist.org/packages/typo3/cms-core","https://typo3.org/security/advisory/typo3-core-sa-2021-001"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:14:57.707777Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 6.2.0, <= 6.2.56","version_start_inclusive":true,"version_end":">= 6.2.0, <= 6.2.56","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 6.2.0, <= 6.2.56:>= 6.2.0, <= 6.2.56"},{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 7.0.0, <= 7.6.50","version_start_inclusive":true,"version_end":">= 7.0.0, <= 7.6.50","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 7.0.0, <= 7.6.50:>= 7.0.0, <= 7.6.50"},{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 8.0.0, <= 8.7.39","version_start_inclusive":true,"version_end":">= 8.0.0, <= 8.7.39","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 8.0.0, <= 8.7.39:>= 8.0.0, <= 8.7.39"},{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 9.0.0, <= 9.5.24","version_start_inclusive":true,"version_end":">= 9.0.0, <= 9.5.24","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 9.0.0, <= 9.5.24:>= 9.0.0, <= 9.5.24"},{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 10.0.0, <= 10.4.13","version_start_inclusive":true,"version_end":">= 10.0.0, <= 10.4.13","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 10.0.0, <= 10.4.13:>= 10.0.0, <= 10.4.13"},{"vendor_slug":"typo3","vendor_name":"TYPO3","product_slug":"typo3.cms","product_name":"TYPO3.CMS","version_start":">= 11.0.0, <= 11.1.0","version_start_inclusive":true,"version_end":">= 11.0.0, <= 11.1.0","version_end_inclusive":true,"cpe23_uri":"cve5:typo3:typo3.cms:>= 11.0.0, <= 11.1.0:>= 11.0.0, <= 11.1.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://packagist.org/packages/typo3/cms-core","source_type":"MISC","tags":[]},{"url":"https://typo3.org/security/advisory/typo3-core-sa-2021-001","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-03-23T01:45:14Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"}]}