ssrf-server-side-request-forgery

ssrf-server-side-request-forgery is a skill for Claude Code, Codex from jinyimeng01/net-code-audit-skill-master. It costs 0 tokens per session (3,631 once invoked), scanned C, original, MulanPSL-2.0.

A security-audit guide for server-side request forgery, where an application is tricked into making requests chosen by a user.

In plain words
What is it for?
Use it when reviewing features that fetch URLs, download resources, or connect to other services from user-provided input.
Why use it?
It helps identify whether attackers could use the server to reach internal services or restricted addresses.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Install

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.

agentmods
npx agentmods add skills/jinyimeng01/net-code-audit-skill-master/ssrf-server-side-request-forgery
Any agent
npx skills add jinyimeng01/net-code-audit-skill-master --skill ssrf-server-side-request-forgery
Clone the repo
git clone --depth 1 https://github.com/jinyimeng01/net-code-audit-skill-master

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for ssrf-server-side-request-forgery

README.md
[![agentmods](https://agentmods.dev/badge/skills/jinyimeng01/net-code-audit-skill-master/ssrf-server-side-request-forgery.svg)](https://agentmods.dev/skills/jinyimeng01/net-code-audit-skill-master/ssrf-server-side-request-forgery)
Your own site
<a href="https://agentmods.dev/skills/jinyimeng01/net-code-audit-skill-master/ssrf-server-side-request-forgery"><img src="https://agentmods.dev/badge/skills/jinyimeng01/net-code-audit-skill-master/ssrf-server-side-request-forgery.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,631 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 3 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.03631
Opus 5 $0.00000 $0.01816
Sonnet 5 $0.00000 $0.00726
Haiku 4.5 $0.00000 $0.00363

Measured 6d ago against content hash 6616754b0464, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade C, and why

ssrf-server-side-request-forgery 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 6d 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.

Reaches for credential filesmediumPrivilege escalation

SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.

{"Image":"alpine","Cmd":["cat","/etc/shadow"],"HostConfig":{"Binds":["/:/host"]}}

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Cloud metadata endpointmediumServer-side request forgery

One request to 169.254.169.254 can return temporary IAM credentials.

> **AI LOAD INSTRUCTION**: Expert SSRF techniques. Covers URL filter bypass, cloud metadata endpoints, protocol exploitation, blind SSRF detection, and chaining to RCE. Base models know basic 169.254.169.254 — this file

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.

- URL parser differential table: Python urllib vs requests vs Java URL vs PHP parse_url vs Node url.parse vs Go net/url
net-skill/dotnet-offsec-audit/references/raw/hack-skills/ssrf-server-side-request-forgery/SKILL.md · 330 lines

The source is not reproduced here

Licensed MulanPSL-2.0

The repository is licensed MulanPSL-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

2 files 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.

Changes

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.

  1. 6d ago First seen · 330 lines · 0 tokens per session scan C 6616754b0464

Subscribe to this mod's changes

ssrf-server-side-request-forgery is a skill published in the GitHub repository jinyimeng01/net-code-audit-skill-master (5 stars, last pushed 4mo ago), licensed MulanPSL-2.0. It costs nothing until one of its globs matches a file; then it loads 3,631 tokens. A static security scan graded it C with 3 findings (reaches for credential files, cloud metadata endpoint, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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