CVE-2025-24856 Information

Description

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

Reference

https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3 https://typo3.org/security/advisory/typo3-ext-sa-2025-001