Individual skill
testing-for-xxe-injection-vulnerabilities
Discovering and exploiting XML External Entity injection vulnerabilities to read server files, perform SSRF, and exfiltrate data during authorized penetration tests.
internal/tools/skills/data/web-application-security/testing-for-xxe-injection-vulnerabilities/SKILL.md
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- Last checked
- Nov 7, 2026
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- Nov 5, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- xxe Declared skill tag
- xml-injection Declared skill tag
- owasp Declared skill tag
- web-security Declared skill tag
- burpsuite Declared skill tag
- data Derived category
- security Derived category
- testing Derived category
- security-application Derived category
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# Testing for XXE Injection Vulnerabilities
## When to Use
- During authorized penetration tests when the application processes XML input (SOAP APIs, file uploads, RSS feeds)
- When testing APIs that accept `Content-Type: application/xml` or `text/xml`
- For assessing XML parsers in file upload functionality (DOCX, XLSX, SVG, PDF)
- When evaluating SOAP-based web services for entity injection
- During security assessments of enterprise applications using XML configuration
## How to CONFIRM a Hit (avoid false negatives)
A true-positive XXE needs the parser to actually resolve your entity — confirm with at least one concrete signal:
- **In-band file read:** a response field reflects file content, e.g. `/etc/passwd` matching the regex `root:.*:0:0:`, or a base64 blob from `php://filter/convert.base64-encode/resource=...`.