Hello:
I have find a Reflected XSS vulnerability in this sdk.
The vulnerability exists due to insufficient filtration of user-supplied data in “payKey” HTTP REQUEST parameter that will be passed to “adaptivepayments-sdk-php-master\samples\SetPaymentOptions.php”. The infected source code is line 24, there is no protection on $_REQUEST['payKey']; if $_REQUEST['payKey'] contains evil js code, line 24 will trigger untrusted code to be executed on the browser side.
Hello:
I have find a Reflected XSS vulnerability in this sdk.
The vulnerability exists due to insufficient filtration of user-supplied data in “payKey” HTTP REQUEST parameter that will be passed to “adaptivepayments-sdk-php-master\samples\SetPaymentOptions.php”. The infected source code is line 24, there is no protection on $_REQUEST['payKey']; if $_REQUEST['payKey'] contains evil js code, line 24 will trigger untrusted code to be executed on the browser side.

So if a attacker construct a special url as follow and send it to a victim, when the victim click the url, the code which is contained in the url will be executed on the victim's browser side to do some evil.
http://your-web-root/adaptivepayments-sdk-php-master/samples/SetPaymentOptions.php?payKey="><script>alert(1);</script><"
The follow scrrenshot is the result to click the upper url ( win7 sp1 x64 + firefox 51.0.1 32bit ):

Discoverer:ADLab of Venustech
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