source: https://www.securityfocus.com/bid/66228/info

GNUboard is prone to multiple SQL-injection vulnerabilities because it fails to sufficiently sanitize user-supplied data.

A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. 

http://www.example.com/bbs/ajax.autosave.php?content=1&subject=1[SQLi]