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 woohyun212/security-skill --skill web-vuln-ssrfgit clone --depth 1 https://github.com/woohyun212/security-skillWrote 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/woohyun212/security-skill/web-vuln-ssrf)<a href="https://agentmods.dev/skills/woohyun212/security-skill/web-vuln-ssrf"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/web-vuln-ssrf/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/woohyun212/security-skill/web-vuln-ssrf"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/web-vuln-ssrf.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 | $0.00020 | $0.04322 |
| Opus 5 | $0.00010 | $0.02161 |
| Sonnet 5 | $0.00004 | $0.00864 |
| Haiku 4.5 | $0.00002 | $0.00432 |
Grade C, and why
web-vuln-ssrf scanned grade C with 2 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 10d 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.
Cloud metadata endpointhighServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
# Apply when direct 127.0.0.1 or 169.254.169.254 is blocked Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `curl` installed How it starts
The opening of the file, as written. The whole thing — 351 lines — stays where its author put it; the contents beside it link to each section on GitHub.
What this skill does
Detects Server-Side Request Forgery (SSRF) vulnerabilities by identifying URL-accepting parameters, confirming blind SSRF via out-of-band (OOB) callbacks, escalating to internal service access, and exploiting cloud instance metadata endpoints (AWS, GCP, Azure). Includes all 11 IP bypass techniques to evade server-side blocklists and filter bypasses, plus chain escalation paths from DNS-only SSRF to cloud credential extraction and RCE.
When to use
- When a request parameter accepts a URL, hostname, IP address, or domain
- When a feature fetches remote content (webhook URLs, avatar URLs, PDF generators, link previews, import by URL)
- When an SVG upload endpoint renders the file server-side
- When a redirect parameter passes user-controlled URLs to a backend fetch
- When an API accepts a
callback,webhook,src,image,next, orredirectparameter
Prerequisites
- An out-of-band callback listener (interactsh recommended:
interactsh-client) curlinstalled- A valid bug bounty or pentest authorization for the target
- For cloud metadata testing: the target must be hosted on AWS, GCP, or Azure (check response headers or DNS for cloud provider signals)
Inputs
| Variable | Required | Description |
|---|---|---|
SECSKILL_TARGET |
Yes | Base URL of the target (e.g., https://app.example.com) |
SECSKILL_SSRF_PARAM |
Yes | Parameter name that accepts a URL (e.g., url, webhook, src) |
SECSKILL_SSRF_ENDPOINT |
Yes | Full endpoint path containing the parameter (e.g., /api/fetch) |
SECSKILL_OOB_HOST |
Yes | Your interactsh or Burp Collaborator host for OOB detection |
SECSKILL_METHOD |
Optional | HTTP method for the endpoint (default: GET) |
SECSKILL_TOKEN |
Optional | Bearer token or session cookie for authenticated endpoints |
SECSKILL_OUTPUT_DIR |
Optional | Directory to save results (default: ./output) |
Workflow
Step 1: Environment setup and injection point identification
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 351 lines · 20 tokens per session scan C d5f69a2b9473
web-vuln-ssrf is a skill published in the GitHub repository woohyun212/security-skill (21 stars, last pushed 4mo ago), licensed MIT. It adds 20 tokens to every session and 4,322 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 2 findings (cloud metadata endpoint, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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