What Is XML External Entity (XXE)?

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XML External Entity (XXE) refers to a specific type of Server-Side Request Forgery (SSRF) attack, whereby an attacker is able to cause Denial of Service (DoS) and access local or remote files and services, by abusing a widely available, rarely used feature in XML parsers. XML is a vastly used data format found in everything from web services (XML-RPC, SOAP, REST, etc.) to documents (XML, HTML, DOCX) and image files (SVG, EXIF data, etc.) use XML.

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