xss-html-injection SKILL.md skillB
xss-html-injection from zebbern/claude-code-guide is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add zebbern/claude-code-guide/xss-html-injection@v1.1Pins v1.1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- zebbern/claude-code-guide
- Path
skills/xss-html-injection/SKILL.md- Versions recorded
- 3
- Latest version
- v1.1, committed May 31, 2026
- First version recorded
- Jan 4, 2026
- Size
- 13,232 bytes
- Repository stars
- 4,700
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cross-Site Scripting and HTML Injection Testing ## Purpose Execute comprehensive client-side injection vulnerability assessments on web applications to identify XSS and HTML injection flaws, demonstrate exploitation techniques for session hijacking and credential theft, and validate input sanitization and output encoding mechanisms. This skill enables systematic detection and exploitation across stored, reflected, and DOM-based attack vectors. ## Inputs / Prerequisites ### Required Access - Target web application URL with user input fields - Burp Suite or browser developer tools for request analysis - Access to create test accounts for stored XSS testing - Browser with JavaScript console enabled ### Technical Requirements - Understanding of JavaScript execution in browser context - Knowledge of HTML DOM structure and manipulation - Familiarity with HTTP request/response headers - Understanding of cookie attributes and session management ### Legal Prerequisites - Written authorization for security testing - Defined scope including target domains and features - Agreement on handling of any captured session data - Incident response procedures established …
Read the whole file at its exact version.
How to install
mdr add zebbern/claude-code-guide/xss-html-injection@sha256:f92f9249d5e97cd9The line at the top of this page pins the label v1.1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ark433jxh4ggrpvp)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jan 4, 2026 and May 31, 2026, about one every 74 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.1 latest | 2026-05-31 | 164971d | 13,232 B | B | view · diff |
| v1.1 | 2026-01-20 | 27bf883 | 13,261 B | B | view · diff |
| git:20260104.9174e17 | 2026-01-04 | 9174e17 | 13,216 B | B | view |
Audit of the latest version
- 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
zebbern/claude-code-guide · 4,700 stars · license MIT · pushed 2026-11-07 · 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
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.