WHM user management system code logic error causes fee Evasion

 
In fact, many VPS service providers are individuals or teams, in order to make a more time-saving user management charging system, many people are directly applied WHMCompleteSolution (http://www.whmcs.com ), which includes PhotonVps. Although the purchase requires a background sales review, if you are charged for free or even pay for an IP address that is not easy to detect, it will bring endless troubles to sellers! It may be a bit difficult to claim this issue, because many people are using it.
Detailed description:

Familiar with it, right? Anyone who buys vps knows it.
Proof of vulnerability:

Solution: modify the code. I have not read the code. The problem is as follows:

 

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Vulnerability response vendor response: unable to contact the vendor or actively refuse