XSS Vulnerability threat in Google Web Optimizer

Recently Google has reported a XSS vulnerability security issue with its Web Optimizer code.So,it has requested its users to update the code in their site immediately.Though the level of threat is low but it is recommended to update the code.The  attacker may exploit this vulnerability and execute malicious code in the victim's site but the attack can be successful  if the attacker has earlier compromised  the web browser.So, friends do update your code immediately and create a new experiment of web optimizer.

Below I have posted the screen shot of the mail that google has sent to my inbox with this alert.

Email: www.securityhunk.com