CVE-2025-58067 Basecamp's Google Sign-In for Rails allowed redirects to protocol-relative URI

Basecamp's Google Sign-In adds Google sign-in to Rails applications. Prior to version 1.3.1, it is possible to redirect a user to another origin if the "proceedto" value in the session store is set to a protocol-relative URL. Normally the value of this URL is only written and read by the library ...