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 agentmods add skills/trilwu/secskills/exploiting-ssrfnpx skills add trilwu/secskills --skill exploiting-ssrfgit clone --depth 1 https://github.com/trilwu/secskillsWrote 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/trilwu/secskills/exploiting-ssrf)<a href="https://agentmods.dev/skills/trilwu/secskills/exploiting-ssrf"><img src="https://agentmods.dev/badge/skills/trilwu/secskills/exploiting-ssrf.svg" alt="Measured on agentmods" 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 | $0.00105 | $0.02632 |
| Opus 5 | $0.00053 | $0.01316 |
| Sonnet 5 | $0.00021 | $0.00526 |
| Haiku 4.5 | $0.00011 | $0.00263 |
Grade B, and why
exploiting-ssrf scanned grade B 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 2d 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 endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
http://169.254.169.254/latest/meta-data/ 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.
rg -n 'requests\.get|urllib|httpx|HttpClient|fetch\(|curl_exec|file_get_contents|WebClient|RestTemplate|http\.Get' -A3 How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Exploiting SSRF
SSRF matters because of what the server can reach that you cannot: the cloud metadata endpoint holding role credentials, internal services with no authentication, and the container network. The vulnerability is trivial; the work is in the bypasses and in knowing which internal target converts a curiosity into a compromise.
Only against systems you are authorized to test.
When to Use
- Any feature that fetches a URL: webhooks, imports, avatar-from-URL, link previews, PDF/screenshot generation, XML/SVG processing, file fetch by URI
- A parameter contains a URL, hostname, IP, or a path that becomes one
- Source review finds an outbound HTTP call with a user-influenced target
- Testing an integration that "calls back" to a customer-supplied endpoint
When NOT to Use
- Client-side request forgery (CSRF) — different vulnerability entirely
- The wider web methodology — use
testing-web-applications - Source review as the main task — use
auditing-code-for-vulnerabilities - Post-exploitation once you hold cloud credentials — use
exploiting-cloud-platforms - Actually pivoting into internal systems beyond agreed scope — SSRF reaches further than most scopes intend; confirm before you traverse
Find It First
# Parameters that are, or become, URLs
rg -n 'url|uri|src|href|path|dest|redirect|next|feed|host|domain|callback|webhook|target|image|file|proxy' --type-add 'req:*.txt' -i
# Source review: outbound calls with an influenced target
rg -n 'requests\.get|urllib|httpx|HttpClient|fetch\(|curl_exec|file_get_contents|WebClient|RestTemplate|http\.Get' -A3
Every SSRF test starts with an out-of-band listener, because most SSRF is blind:
# Burp Collaborator, interact.sh, or your own DNS+HTTP logger
interactsh-client -v
# Submit http://<unique>.oast.example/ and watch for DNS and HTTP hits
DNS resolution alone is a positive signal. A DNS lookup with no HTTP request usually means the server resolved the host and then blocked the connection — the SSRF exists and a filter is in the way, which tells you to move to bypasses rather than abandon the parameter.
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.
- 2d ago First seen · 222 lines · 105 tokens per session scan B f95d5ee13460
exploiting-ssrf is a skill published in the GitHub repository trilwu/secskills (134 stars, last pushed yesterday), licensed MIT. It adds 105 tokens to every session and 2,632 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B 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 2026-09-03.
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