source: https://www.securityfocus.com/bid/17588/info

RechnungsZentrale V2 is prone to an SQL-injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query. 

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

Version 1.1.3 is vulnerable; other versions may also be affected.

An example has been provided:

User: ' OR '1'='1
Password: 1