{"id":"CVE-2025-24856","aliases":["GHSA-hj78-p4h7-m5fv"],"url":"https://o3.security/vulnerability/CVE-2025-24856","summary":"TYPO3-EXT-SA-2025-001: Account Takeover in extension \"OpenID Connect Authentication\" (oidc)","details":"## Problem Description\nA vulnerability in the account linking logic of the extension allows a pre-hijacking attack leading to Account Takeover. The attack can only be exploited if the following requirements are met:\n\n- An attacker can anticipate the email address of the user.\n- An attacker can register a public frontend user account using that email address before the user's first OIDC login.\n- The IDP returns the field email containing the email address of the user\n\n## Solution\nAn updated versions 4.0.0 is available from the TYPO3 extension manager, packagist and at \nhttps://extensions.typo3.org/extension/download/oidc/4.0.0/zip\n\nUsers of the extension are advised to update the extension as soon as possible.","published":"2025-03-16T00:00:00Z","modified":"2026-10-28T02:30:59.010032928Z","cvss":{"score":4.2,"severity":"MEDIUM","vector":"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"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"causal/oidc","fixedVersion":"4.0.0"}],"fix":{"url":"https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3","label":"xperseguers/t3ext-oidc@877e09f"},"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"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/causal/oidc/CVE-2025-24856.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:59.010032928Z"}}