There has been a security issue identified in the software zencart, which you may be using to run your online shop.
The files to download (v1.3.8 only) are here:
http://www.iwebshop.co.uk/security_patch_v138_20090619.zip
Complete instructions are in the download.
iwebshop also offer a free service to have the patch installed for you: http://www.iwebshop.co.uk/apply-admin-security-patch-june-2009-p-60.html
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