XML - External access

I am planning on saving content of some HTML sites in XML docs. These XML docs will be publicly available to read, however, are there vulnerabilities that could allow outsiders to write to my XML docs? I'll be using simpleXML (PHP script) to allow logged in users to edit their开发者_Python百科 own XML doc.

Please let me know, thanks!

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If the permissions on the XML files are read-only for the public (775 at most), and only logged-in users can edit via PHP, then you shouldn't have anything to worry about.