The LoginRadius backend did not validate OAuth state during the authentication flow.

Applications using this backend were vulnerable to login CSRF. An attacker could cause a victim's browser session to complete authentication using an attacker-controlled LoginRadius token, making the victim authenticated as the attacker's LoginRadius identity.

The issue affects only applications using the LoginRadius backend.

The issue has been fixed by enabling callback state validation for the LoginRadius backend.

Users should upgrade to a patched version.

Fix:

Applications that cannot upgrade immediately should disable the LoginRadius backend by removing it from SOCIAL AUTH AUTHENTICATION BACKENDS.

There is no complete workaround while continuing to use the vulnerable backend.

Reported through GitHub private vulnerability reporting by Liyi Zhou, Ziyue Wang, Strick, Maurice, and Chenchen Yu from the University of Sydney security research team.

Reporter references: