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Blind XXE with OAST

For an authorized XML parser assessment, use an external entity that resolves only to a controlled callback and proves parser behavior without reading local files or reaching internal networks.

Tags: xxe, oast, xml, authorized-testing

Controlled probes

  • DOCTYPE with an external SYSTEM identifier at https://UNIQUE-CALLBACK.example/xxe/probe-001
  • Use a harmless static XML body and one unique identifier per parser surface
  • Stop at the callback; do not request files, metadata endpoints, or internal hosts

Source: https://owasp.org/www-community/vulnerabilities/XML_External_Entity_%28XXE%29_Processing