{"id":"CVE-2025-24856","details":"An issue was discovered in the oidc (aka OpenID Connect Authentication) extension before 4.0.0 for TYPO3. The account linking logic allows a pre-hijacking attack, leading to Account Takeover. The attack can only be exploited if the following requirements are met: (1) an attacker can anticipate the e-mail address of the user, (2) an attacker can register a public frontend user account using that e-mail address before the user's first OIDC login, and (3) the IDP returns an email field containing the e-mail address of the user,","aliases":["GHSA-hj78-p4h7-m5fv"],"modified":"2026-08-12T03:51:42.740068533Z","published":"2025-03-16T00:00:00Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24856.json","cna_assigner":"mitre","cwe_ids":["CWE-348"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24856.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-24856"},{"type":"ADVISORY","url":"https://typo3.org/security/advisory/typo3-ext-sa-2025-001"},{"type":"FIX","url":"https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xperseguers/t3ext-oidc","events":[{"introduced":"0"},{"fixed":"cbba4d16fcc00616576258abe5e37229daa7e9a6"},{"fixed":"877e09f6faf4c87bbb41233112ec7e30d3c902b3"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"4.0.0"}]}}],"versions":["v3.0.0","2.1.0","2.0.0","1.2.0","1.1.0","1.0.0","0.5.0","0.2.0","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-24856.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C"}]}