On the heals of the previously discovered Yoast SEO Plugin Security Patch on March 11, 2015, Yoast has found a similar security problem with their Google Analytics WordPress plugin. You can read all about this security problem and what Yoast is doing to prevent such problem in the future on their blog:
Modern Retail has proactively patched every WordPress instance using this Yoast plugin.
If you have any questions please submit a Support Request, and we'll be glad to help.