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ClaudSkills / Science & Research / research-methods

Detect Xxe

Category: Science & Research  ·  Sub-category: research-methods  ·  Last updated:
Detection and response methodology for XML External Entity (XXE) processing and out-of-band (OOB) callback abuse against XML-parsing web applications and APIs (MITRE ATT&CK T1190, with T1048 and T1552.005 for the OOB and SSRF variants). Covers inbound XML bodies carrying document-type and entity declarations, and the higher-confidence signal of a web-tier process making a first-seen DNS or HTTP request right after parsing untrusted XML. Keyed off WAF body-inspection logs, XML parser error logs, Sysmon Event ID 22 and 3, Zeek dns.log and conn.log, and cloud VPC Flow and DNS resolver logs. Gives the method, a hypothesis-driven hunt, and parser-hardening guidance. Use when triaging a suspected XXE or XML injection, hunting for out-of-band callbacks from app servers, reviewing XXE or SSRF detections, investigating a web server making unexpected outbound DNS, or hardening XML parsers against external entity resolution.
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Detect Xxe is a community-contributed Claude Code skill in the research-methods sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/detect-xxe/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when triaging a suspected XXE or XML injection, hunting for out-of-band callbacks from app servers, reviewing XXE or SSRF detections, investigating a web server making unexpected outbound DNS, or hardening XML parsers against external entity resolution.

Who uses this skill

The Detect Xxe Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/detect-xxe
curl -L https://claudskills.com/skills/detect-xxe/SKILL.md \
  -o ~/.claude/skills/detect-xxe/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/detect-xxe/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/detect-xxe/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\detect-xxe\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Detect Xxe Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/detect-xxe/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Detect Xxe skill do?
Detection and response methodology for XML External Entity (XXE) processing and out-of-band (OOB) callback abuse against XML-parsing web applications and APIs (MITRE ATT&CK T1190, with T1048 and T1552.005 for the OOB and SSRF variants). Covers inbound XML bodies carrying document-type and entity declarations, and the higher-confidence signal of a web-tier process making a first-seen DNS or HTTP request right after parsing untrusted XML. Keyed off WAF body-inspection logs, XML parser error logs, Sysmon Event ID 22 and 3, Zeek dns.log and conn.log, and cloud VPC Flow and DNS resolver logs. Gives the method, a hypothesis-driven hunt, and parser-hardening guidance. Use when triaging a suspected XXE or XML injection, hunting for out-of-band callbacks from app servers, reviewing XXE or SSRF detections, investigating a web server making unexpected outbound DNS, or hardening XML parsers against external entity resolution.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Detect Xxe skill?
Use Detect Xxe when your Claude Code task falls under the Science & Research category — specifically in the research methods area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Detect Xxe" or describe the task and let Claude pick). Browse related skills at /category/science/.
What is a Claude Code skill and how does the Detect Xxe skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Detect Xxe is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
umbrasec-labs. (2026). Detect Xxe [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/detect-xxe/
BibTeX
@misc{detect-xxe-2026,
  author    = {umbrasec-labs},
  title     = {Detect Xxe [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/detect-xxe/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (network), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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More Science & Research skills

Browse all Science & Research skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Science & Research skills → Top 100 skills
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