zebbern/claude-code-guide · skills/html-injection-testing/SKILL.md

html-injection-testing skillF

html-injection-testing is agent-read markdown (skill) from zebbern/claude-code-guide: This skill should be used when the user asks to "test for HTML injection", "inject HTML into web pages", "perform HTML injection attacks", "deface web applications", or "test content injection vulnerabilities". It provides comprehensive HTML injection attack techniques and testing methodologies..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add zebbern/claude-code-guide/html-injection-testing@v1.1
Exact content
mdr add zebbern/claude-code-guide/html-injection-testing@sha256:0698b5b945b44c0c

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_377ufbt5jnlqsfxy.svg)](https://markdownregistry.com/a/art_377ufbt5jnlqsfxy)

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Versions

versioncommittedcommitsizeaudit
v1.1 latest2026-05-31 164971d 13,044 BF view · diff
v1.12026-01-20 27bf883 13,044 BF view · diff
git:20260104.9174e172026-01-04 9174e17 12,999 BF view

Audit of the latest version

F  15 of 17 checks passed. Deterministic, no model, same answer every run.
  • FAIL, critical: No text hidden with inline styles (matched: style="background:red;color:white)
  • fail: No script tag (matched: <script)
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (13044 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address

Source

GitHub

zebbern/claude-code-guide · 4,627 stars · license MIT · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_377ufbt5jnlqsfxy
GET https://markdownregistry.com/api/v1/resolve?ref=zebbern/claude-code-guide/html-injection-testing
GET https://markdownregistry.com/api/v1/blob/0698b5b945b44c0cad2c85e729fb003a8a814088774036d56a50cbacba5ea4c3

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.