dom-vulnerability-detection SKILL.md skillB
dom-vulnerability-detection from dreadnode/capabilities is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dreadnode/capabilities/dom-vulnerability-detection@git:20260923.1ccb5b1Pins git:20260923.1ccb5b1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/dom-vulnerability-detection/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260923.1ccb5b1, committed Sep 23, 2026
- First version recorded
- May 4, 2026
- Size
- 12,316 bytes
- Repository stars
- 22
- License
- MIT
DOM-based XSS and client-side vulnerability detection via dynamic analysis -- trace attacker-controlled sources to dangerous sinks, audit postMessage handlers, test CSTI in Angular/Vue/htmx, and check for DOM clobbering. Use when auditing JavaScript code, reviewing client-side security, analyzing DOM manipulation, or testing postMessage handlers.
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
## Sources (attacker-controlled input)
`location.hash`, `location.search`, `location.href`, `document.URL`, `document.referrer`, `window.name`, `postMessage event.data`, `document.cookie`, `localStorage`/`sessionStorage`
## Sinks (dangerous output)
`innerHTML`, `outerHTML`, `document.write()`, `eval()`, `setTimeout(string)`, `new Function()`, `location.href=`, `location.assign()`, `element.src=`, `jQuery.html()`, `$.globalEval()`, `v-html`, `ng-bind-html`, `dangerouslySetInnerHTML`
## Analysis workflow
### 1. Find sources reaching sinks
```bash
# Search for dangerous sinks in JS files
rg "innerHTML|outerHTML|document\.write|\.html\(" --type js --type ts -n src/
rg "eval\(|setTimeout\(|setInterval\(|new Function\(" --type js -n src/
# Search for postMessage handlers without origin checks
rg "addEventListener.*message" --type js -n src/
# ...but that grep alone MISSES most real-world handlers. Also search:
rg "onmessage\s*=" --type js -n src/ # setter assignment
rg "MessagePort|MessageChannel|\.port[12]?\." --type js -n src/ # MessageChannel
```
**A grep for `addEventListener("message")` is not a complete listener inventory.** See
…Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/dom-vulnerability-detection@sha256:2b205fd739608e23The line at the top of this page pins the label git:20260923.1ccb5b1, 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_yubqq4466jq7k36s)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between May 4, 2026 and Sep 23, 2026, about one every 28 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260923.1ccb5b1 latest | 2026-09-23 | 1ccb5b1 | 12,316 B | B | view · diff |
| git:20260820.ee77f46 | 2026-08-20 | ee77f46 | 12,325 B | B | view · diff |
| git:20260706.00661a3 | 2026-07-06 | 00661a3 | 4,301 B | B | view · diff |
| git:20260529.8f6ea0e | 2026-05-29 | 8f6ea0e | 3,726 B | A | view · diff |
| git:20260528.f3e4348 | 2026-05-28 | f3e4348 | 5,493 B | A | view · diff |
| git:20260504.2a64374 | 2026-05-04 | 2a64374 | 14,403 B | B | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12316 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 script tag
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
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yubqq4466jq7k36s GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/dom-vulnerability-detection GET https://markdownregistry.com/api/v1/blob/2b205fd739608e230ad05809229f136d21fcfb724668f5b68e9baf033cf555a2
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.