Web sites use cookies as a way to store information on a user's local system. Most often, this information is used for customizing and retaining a site's setting for a user across multiple sessions. By design each site should maintain its own cookies on a user's machine and be able to access only those cookies.

A vulnerability exists because it is possible to craft a URL that can allow sites to gain unauthorized access to user's cookies and potentially modify the values contained in them. Because some web sites store sensitive information in a user's cookies, it is also possible that personal information could be exposed.

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