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# PHPExcel User Documentation – Reading Spreadsheet Files
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## Security
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XML-based formats such as OfficeOpen XML, Excel2003 XML, OASIS and Gnumeric are susceptible to XML External Entity Processing (XXE) injection attacks (for an explanation of XXE injection see http://websec.io/2012/08/27/Preventing-XEE-in-PHP.html) when reading spreadsheet files. This can lead to:
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- Disclosure whether a file is existent
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- Server Side Request Forgery
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- Command Execution (depending on the installed PHP wrappers)
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To prevent this, PHPExcel sets `libxml_disable_entity_loader` to `true` for the XML-based Readers by default.
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