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

xss-html-injection skillB

xss-html-injection is agent-read markdown (skill) from zebbern/claude-code-guide: This skill should be used when the user asks to "test for XSS vulnerabilities", "perform cross-site scripting attacks", "identify HTML injection flaws", "exploit client-side injection vulnerabilities", "steal cookies via XSS", or "bypass content security policies". It provides comprehensive techniques for detecting, exploiting, and understanding XSS and HTML injection attack vectors in web applications..

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/xss-html-injection@v1.1
Exact content
mdr add zebbern/claude-code-guide/xss-html-injection@sha256:f92f9249d5e97cd9

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_ark433jxh4ggrpvp.svg)](https://markdownregistry.com/a/art_ark433jxh4ggrpvp)

0 badge views in 30 days

Versions

versioncommittedcommitsizeaudit
v1.1 latest2026-05-31 164971d 13,232 BB view · diff
v1.12026-01-20 27bf883 13,261 BB view · diff
git:20260104.9174e172026-01-04 9174e17 13,216 BB view

Audit of the latest version

B  16 of 17 checks passed. Deterministic, no model, same answer every run.
  • 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 (13232 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 text hidden with inline styles
  • 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_ark433jxh4ggrpvp
GET https://markdownregistry.com/api/v1/resolve?ref=zebbern/claude-code-guide/xss-html-injection
GET https://markdownregistry.com/api/v1/blob/f92f9249d5e97cd9f96622dcc650f1496590a8649089de17c117f23dd979d84c

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