MPOS (cryptocurrencies mining portal) XSS

During another "sprint code review" session I found a simple XSS in MPOS JSONP handling. MPOS is a web based mining portal for various crypto currencies written in PHP.



Vulnerable is callback parameter introduced in this commit. (note: Content-Type response header is text/html)

Attacker needs a valid api key. Usually he can get it by just signing up to a pool.

Example:

https://pool/index.php?callback=XSS&page=api&action=getuserstatus&api_key=VALID_API_KEY

Found and reported: 25.05.2014
Fixed: 10.06.2014

Ps. It was introduced after more or less security-related discussion here.