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hunt-open-redirect SKILL.md skillC

hunt-open-redirect 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-open-redirect@git:20260910.546fe86

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

Audit grade: C, 15 of 17 checks passed
Kind: SKILL.md skill
Repository: novaestellar/novahaku
Path: testing/hunt/hunt-open-redirect/SKILL.md
Versions recorded: 3
Latest version: git:20260910.546fe86, committed Sep 10, 2026
First version recorded: Sep 3, 2026
Size: 5,102 bytes
Repository stars: 28
License: MIT

Hunt Open Redirect — all types including low-impact, chained to OAuth token theft → ATO, phishing chains. URL parameter manipulation, JavaScript redirect, meta refresh, header injection. Use when hunting redirect bugs or building ATO chains.

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

# HUNT-OPEN-REDIRECT — Open Redirect

## Crown Jewel Targets

Open redirect alone is Low. Chained to OAuth = Critical (ATO).

**Highest-value chains:**
- **Open redirect → OAuth auth code theft** — redirect_uri contains open redirect on trusted domain → auth code sent to attacker → ATO
- **Open redirect → phishing** — users trust the URL because it starts with target.com
- **Open redirect → SSRF escalation** — if redirect followed server-side → SSRF
- **Open redirect → session fixation** — force user to login endpoint with pre-set session

---

## Attack Surface Signals

```
?redirect=
?next=
?url=
?return=
?returnTo=
?continue=
?dest=
?destination=
?go=
?forward=
?location=
?target=
?redir=
?redirect_uri=
?callback=
?checkout_url=
?success_url=
?cancel_url=
/logout?returnTo=
/login?next=
/sso?callback=
```

---

## Bypass Table

| Technique | Payload |
|-----------|---------|
| Basic | `https://evil.com` |
| Protocol relative | `//evil.com` |
| Backslash bypass | `/\\evil.com` |
| At-sign confusion | `https://target.com@evil.com` |
| Double slash | `//evil.com/%2F..` |
| URL encoding | `%2Fevil.com` |
| Null byte | `evil.com%00target.com` |
| Whitespace | `evil.com%09` or `%20` |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add novaestellar/novahaku/hunt-open-redirect@sha256:0d947e9da79ca228

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_kptaocze6bia4xur.svg)](https://markdownregistry.com/a/art_kptaocze6bia4xur)

4 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	5,102 B	C	view · diff
git:20260903.29924dd	2026-09-03	29924dd	5,114 B	C	view · diff
git:20260903.fa855c4	2026-09-03	fa855c4	5,085 B	C	view

Audit of the latest version

C 15 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

fail: No link to a raw IP address (matched: http://169.254.169.254)
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 (5102 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

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

GitHub

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

API

GET https://markdownregistry.com/api/v1/artifacts/art_kptaocze6bia4xur
GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-open-redirect
GET https://markdownregistry.com/api/v1/blob/0d947e9da79ca2287066bfdeb32bb9f4b03c826990c62675367de5e2a2b746bf

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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