cve/2020/CVE-2020-21503.md

### [CVE-2020-21503](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-21503)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

waimai Super Cms 20150505 has a logic flaw allowing attackers to modify a price, before form submission, by observing data in a packet capture. By setting the index.php?m=gift&a=addsave credit parameter to -1, the product is sold for free.

### POC

#### Reference
- https://github.com/caokang/waimai/issues/15
- https://github.com/caokang/waimai/issues/15

#### Github
No PoCs found on GitHub currently.