Ummm. I highly suggest that you continue a full file comparison of your site with a clean install as it would appear that you're site has been hacked. The method of entry is not evident and would likely need to be discovered and closed, but that code is an attempt to access data on/in your system.
Please follow the advise of this ZC posting on addressing being hacked: http://www.zen-cart.com/wiki/index.p...ing_From_Hacks
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