Security Best Practice: Preventing Search Engine Robots from Archiving CFID and CFTOKEN
Internet search engines robots often archive even special content generated when an URL is accessed, such as CFID and CFTOKEN, which can pose a security risk. Here is an article explaining how to prevent your CFID and CFTOKEN variables from being logged on a public search engine.
Security Best Practice: Preventing Search Engine Robots from Archiving CFID and CFTOKEN