Description
WordPress Plugin Super CAPTCHA is prone to an SQL injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query. Exploiting this issue could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. Successful exploitation requires that attacker is logged in as "admin" and that "magic_quotes" directive is set to "Off". WordPress Plugin Super CAPTCHA version 2.2.4 is vulnerable; other versions may also be affected.
Remediation
Edit the source code to ensure that input is properly sanitised or disable the plugin until a fix is available
References
http://www.securityfocus.com/bid/49344/exploit
http://www.exploit-db.com/exploits/17728/
http://packetstormsecurity.com/files/view/104521/wpsupercaptcha-sql.txt