source: https://www.securityfocus.com/bid/25109/info

Berthanas Ziyaretci Defteri 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.

Berthanas Ziyaretci Defteri 2.0 is affected; other versions may also be vulnerable.

To demonstrate this issue, use the following string for both the username and password of the vulnerable script:

' OR '1'='1