Navigating to a local file might result in that file opening in a handler application in a dangerous or unexpected way. Pulling remote resources over file:// can leak your user account information and a hash of your password to the remote site. What makes this extra horrific is that if you log into Windows using an MSA account, the bad guy gets both your global userinfo AND a hash he can try to crack.īeyond the data leakage risks related to remote file retrieval, other vulnerabilities related to opening local files also exist. The most obvious problem is that the way file:// retrieves content can result in privacy and security problems. No option to disable this navigation blocking is available in Chrome or Edge 76+, but ( UPDATE) a Group Policy IntranetFileLinksEnabled was added to Edge 95+. In contrast, Edge18 (like Internet Explorer before it) allowed pages in your Intranet Zone to navigate to URLs that use the file:// url protocol only pages in the Internet Zone were blocked from such navigations 1. If you open the Developer Tools console, you’ll see a note: “ Not allowed to load local resource: file://host/whatever”. If a browser user clicks on a file:// link on an https-delivered webpage, nothing visibly happens. For security reasons, Microsoft Edge 76+ and Chrome impose a number of restrictions on file://URLs, including forbidding navigation to file:// URLs from non-file:// URLs.
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