novaestellar/novahaku · testing/hunt/hunt-html-injection/SKILL.md

hunt-html-injection skillB

hunt-html-injection is agent-read markdown (skill) from novaestellar/novahaku: Hunt HTML Injection — user-supplied input is rendered as raw HTML in the response without sanitisation, allowing an attacker to inject arbitrary HTML tags (but not necessarily JavaScript). Lower severity than XSS but enables phishing, UI manipulation, and credential harvesting via injected forms. Use when testing text-display surfaces (search results, profile fields, comments, error messages, feedback forms). For markup that executes JavaScript, escalate to hunt-xss..

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 novaestellar/novahaku/hunt-html-injection@git:20260910.546fe86
Exact content
mdr add novaestellar/novahaku/hunt-html-injection@sha256:f860af543afefb44

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_maz6xswh63uz7yhe.svg)](https://markdownregistry.com/a/art_maz6xswh63uz7yhe)

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Versions

versioncommittedcommitsizeaudit
git:20260910.546fe86 latest2026-09-10 546fe86 3,453 BB view · diff
git:20260903.29924dd2026-09-03 29924dd 3,465 BB view · diff
git:20260903.fa855c42026-09-03 fa855c4 3,436 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 (3453 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

novaestellar/novahaku · 19 stars · license none · pushed 2026-09-10 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_maz6xswh63uz7yhe
GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-html-injection
GET https://markdownregistry.com/api/v1/blob/f860af543afefb4406abf2f60b7420fb7be06ce846a2ddf927ffafd76d6716b9