source: https://www.securityfocus.com/bid/26526/info

E-vanced Solutions E-vents is prone to multiple input-validation vulnerabilities because it fails to sufficiently sanitize user-supplied data.

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. 

http://www.example.com/eventsignup.asp?ID=4197 UNION ALL SELECT username, etc FROM users--