Account takeover in OpenID Connect Authentication extension for Typo3



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-24856
CWE-ID CWE-285
Exploitation vector Network
Public exploit N/A
Vulnerable software
 OpenID Connect Authentication
Web applications / Modules and components for CMS

Vendor Xavier Perseguers

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper authorization

EUVDB-ID: #VU103413

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-24856

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a remote attacker to hijack accounts.

The vulnerability exists due to an issue in account linking logic. A remote attacker can register a public frontend user account using email address before the user's first OIDC login and take over victim's account after oidc is used at a later stage.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenID Connect Authentication: 3.0.0

CPE2.3 External links

https://typo3.org/security/advisory/typo3-ext-sa-2025-001/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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