This security bulletin contains one high risk vulnerability.
Exploit availability: NoDescription
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to the affected extension fails to validate the response from the Identity Provider. A remote attacker can bypass authentication process and create various frontend users on affected TYPO3 websites.
Note: The authentication service allows to bypass frontend user authentication by providing a valid username with an empty password, if a SAML configuration is not created for the current website domain.Mitigation
Install updates from vendor's website.Vulnerable software versions
MKSamlAuth: 8.7.0 - 9.5.2
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.