Fix Bug for website

I am looking for an experienced freelancer to help me fix a bug on my website. The nature of the bug is that someone can control my website and potentially steal my balance. I currently don't know which page or section of my website the bug is occurring, so the freelancer would need to find that out. My website is of medium complexity, with 4-10 pages and some advanced features. If you are interested and have the necessary experience to handle this project please feel free to contact me. Thank you.