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GHSA-4pc7-vqv5-5r3v

ECP SAML binding bypasses authentication flows

Source: GitHub Advisory Database (reviewed) High CVE-2021-3827

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-saml-core < 18.0.0 18.0.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Description A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.

References

External links from the advisory. They lead to third-party sites.