source: https://www.securityfocus.com/bid/59041/info

Hero is prone to multiple cross-site scripting vulnerabilities because it fails to sufficiently sanitize user-supplied input.

Exploiting these issues could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

Hero 3.791 is vulnerable; other versions may also be affected.

http://www.example.com/users/forgot_password?error=PHNjcmlwdD5hbGVydChkb2N1bWVudC5jb29raWUpOzwvc2NyaXB0Pg==