TYPO3-EXT-SA-2025-001: Account Takeover in extension "OpenID Connect Authentication" (oidc)
## Problem Description A 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: - An attacker can anticipate the email address of the user. - An attacker can register a public frontend user account using that email address before the user's first OIDC login. - The IDP returns the field email containing the email address of the user ## Solution An updated versions 4.0.0 is available from the TYPO3 extension manager, packagist and at https://extensions.typo3.org/extension/download/oidc/4.0.0/zip Users of the extension are advised to update the extension as soon as possible.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-24856US | —OT elevated | — | ||
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 Accoun… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/causal/oidc/CVE-2025-24856.yamlWEB
- https://github.com/xperseguers/t3ext-oidc/commit/877e09f6faf4c87bbb41233112ec7e30d3c902b3WEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-24856ADVISORY
- https://typo3.org/security/advisory/typo3-ext-sa-2025-001WEB
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