Google reader is supposed to display only those contents which the user has subscribed to however two vulnerabilities has been identified which may allow an attacker to entice it’s victim (using google reader service) to view unwanted web contents carrying malicious payloads.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/45443/google-reader.txt
Source: https://packetstormsecurity.com/files/45443/google-reader.txt.html