If you have Ultimate SEO URLs installed and you are having & in url query string, go to your admin configuration. Under SEO URLS configuration, change “Output W3C valid URLs (parameter stirngs)” to false as shown in the left image.
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One of my customers was having this error and customers were being forwarded to my Anti-XSS IP trap. NOT GOOD. Thank you for the fix. I couldn’t find the solution on oscommerce.com.
thanks Sam!