Does it open any attack vector if an ajax-driven site uses a unique token stored as a javascript variable and verifies it with every request to prevent CSRF — provided that the site is free from XSS holes?
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Does it open any attack vector if an ajax-driven site uses a unique token stored as a javascript variable and verifies it with every request to prevent CSRF — provided that the site is free from XSS holes?
It doesn’t open it up to attack. If the site is free from XSS holes, there is no way another page could get the token from a javascript variable.