hunt-csrf SKILL.md skillA

hunt-csrf from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add novaestellar/novahaku/hunt-csrf@git:20260910.546fe86

Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: novaestellar/novahaku
Path: testing/hunt/hunt-csrf/SKILL.md
Versions recorded: 3
Latest version: git:20260910.546fe86, committed Sep 10, 2026
First version recorded: Sep 3, 2026
Size: 26,303 bytes
Repository stars: 28
License: MIT

Hunting skill for csrf vulnerabilities. Built from 15 public bug bounty reports including modern variants — SameSite=Lax sibling-subdomain bypass (Argo CD CVE-2024-22424), GraphQL mutations-via-GET (GitLab $3,370), framework-wide CSRF middleware disabled (Stripe Dashboard $5,000), path-traversal CSRF-token bypass (GitHub Enterprise CVE-2022-23732 $10k), Origin-omission bypass (TikTok $2,500), OAuth-state null-byte (Streamlabs), WebSocket CSRF / CSWSH (Coda), default-SameSite email-change → ATO…

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

## Shortcut: a raw HTTP client beats a real cross-origin page for header-check CSRF

A raw HTTP client (curl, Burp Repeater, any scripting client) is not a browser: it will send
whatever `Origin`/`Referer` header VALUE you set, from any path, on the same connection as your
authenticated cookie. Many apps that claim to defend against CSRF only do a naive **string check**
on the incoming `Origin`/`Referer` header (does it contain/equal some expected value?) rather than
real same-origin enforcement — you can satisfy that check directly by setting the header, with no
actual cross-site delivery (hosting an HTML page, a headless browser) required. This is faster and
more reliable than building a real attacker page for this exact pattern:
```
POST /profile HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Origin: https://a-domain-the-app-treats-as-trusted-or-attacker-controlled.example
Cookie: <authenticated session>

username=csrf_poc
```
If some text names a SPECIFIC origin/domain as the "expected" attacker page, that literal value is
often exactly what the server's check is looking for — try it verbatim in `Origin` (fall back to
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add novaestellar/novahaku/hunt-csrf@sha256:d65d3ed887bfead6

The line at the top of this page pins the label git:20260910.546fe86, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_6wfxnxzahsdojnh2.svg)](https://markdownregistry.com/a/art_6wfxnxzahsdojnh2)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 3 versions of this file, between Sep 3, 2026 and Sep 10, 2026, about one every 3 days.

version	committed	commit	size	audit
git:20260910.546fe86 latest	2026-09-10	546fe86	26,303 B	A	view · diff
git:20260903.29924dd	2026-09-03	29924dd	26,315 B	A	view · diff
git:20260903.fa855c4	2026-09-03	fa855c4	26,286 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (26303 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
pass: No script tag

Source

GitHub

novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6wfxnxzahsdojnh2
GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-csrf
GET https://markdownregistry.com/api/v1/blob/d65d3ed887bfead6796ef98632db651541ce7043383d8b8e9ee81ba79ca607b9

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.

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