pr0letariat has discovered a vulnerability in HitAppoint, which can be exploited by malicious people to conduct SQL injection attacks.
Input passed via the "username" parameter to index.php (if "nts-panel" is set to "anon/login") is not properly sanitised before being used in SQL queries. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.
The vulnerability is confirmed in HitAppoint Lite 4.5.17. Other versions may also be affected.
Vulnerable Products
Vulnerable Software: HitAppoint 4.x
Solution
Edit the source code to ensure that input is properly sanitised.