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There have been issues with filter_var when used with FILTER_VALIDATE_EMAIL in the past, however I cannot find any vulnerabilities with FILTER_VALIDATE_IP. Even though an IP address does not contain characters that have special meaning within HTML (e.g. <) or have characters that can break out of a database query (e.g. '), I would treat the value like ...


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DOM XSS are as dangerous as reflected XSS. To exploit it the attacker always needs to induce a client to create a request (f.e. by clicking some link that still points to the considered safe site). After this has been done, you can execure JavaScript on the client's browser. This can lead to all sort of attacks on the browser!



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