XSS Bug Found in Blogspot Sites

An XSS  bug has been found by the member of the famous BlackHat team in Indonesia, Indonesian Cyber Army. 

Dork:

inurl:/feeds/posts/

Live Demo:

http://avematic-security.blogspot.com/feeds/posts/K3RAMA7_W4S_H3RE 

Preview:

Credit to:
             - Bug Founder
             - My friend from Gh0sts team, told me about this bug.