A security-testing workflow for studying web application firewalls, which filter web requests to block suspected attacks, and testing whether authorized requests are detected or rejected.

Use it for authorized WAF detection, fingerprinting, and analysis of request filtering, including 403, 406, or 429 responses and blocked payloads.

It organizes firewall identification and request testing while warning that blocked requests may be logged and trigger defensive responses.

waf-bypass — Skill for Claude Code and Codex by ogrodev: A security-testing workflow for studying web application firewalls, which…

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/ogrodev/fsociety/waf-bypass

Any agent

npx skills add ogrodev/fsociety --skill waf-bypass

Clone the repo

git clone --depth 1 https://github.com/ogrodev/fsociety

Made for: Claude Code, Codex.

Or install elliot, the plugin that ships this one along with the rest of its 9 skills, 24 commands, 2 agents, 4 hooks.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ogrodev/fsociety/waf-bypass.svg)](https://agentmods.dev/skills/ogrodev/fsociety/waf-bypass)

Your own site

<a href="https://agentmods.dev/skills/ogrodev/fsociety/waf-bypass"><img src="https://agentmods.dev/badge/skills/ogrodev/fsociety/waf-bypass.svg" alt="Measured on agentmods" height="20"></a>

Per session 520 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,768 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. Scan, not verified.

Origin original 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.

Model	Per session	Once invoked
Fable 5	$0.00520	$0.03768
Opus 5	$0.00260	$0.01884
Sonnet 5	$0.00104	$0.00754
Haiku 4.5	$0.00052	$0.00377

Measured 5d ago against content hash 43f7e775f420, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

waf-bypass 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 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -H "Host: target.com" https://ORIGIN_IP/ --resolve target.com:443:ORIGIN_IP

elliot/skills/waf-bypass/SKILL.md · 284 lines

How it starts

The opening of the file, as written. The whole thing — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.

WAF Bypass

Web Application Firewalls inspect HTTP traffic and block requests matching known attack signatures. Every commercial WAF has implementation gaps — regex engine limits, encoding blind spots, protocol handling quirks, and normalization inconsistencies. Exploiting these gaps requires methodical identification of the WAF technology, understanding its rule engine, and crafting payloads that bypass detection without altering exploit semantics.

WAFs log aggressively. Every blocked request is recorded with your source IP, the matched rule ID, and the full request. Careless testing burns your IP, triggers escalating defenses (CAPTCHA, tarpit, permanent block), and alerts blue teams. Approach WAF bypass as a precision operation.

Triage Workflow

Follow this sequence. Each phase builds on the previous one.

Phase 1 — WAF Detection and Fingerprinting

Identify whether a WAF exists and which product it is. Do not skip this — blind bypass attempts waste time and generate noise.

Load: ToolSearch → select:mcp__hexstrike-ai__wafw00f_scan

# Primary detection — wafw00f identifies 150+ WAFs
wafw00f https://target.com

# Verbose mode reveals detection method
wafw00f https://target.com -v

# Scan all URLs in scope
wafw00f -i urls.txt -o waf-results.json

# Secondary — nmap NSE scripts
nmap -p 443 --script http-waf-detect target.com
nmap -p 443 --script http-waf-fingerprint target.com

Manual fingerprinting when tools are inconclusive:

Send a benign request, note response headers (Server, X-Powered-By, Via, X-CDN)
Send a clearly malicious request (?id=1' OR 1=1--), note the block response
Compare block page HTML, status code, and headers against known WAF signatures
Check Set-Cookie names — Cloudflare uses __cf_bm, Incapsula uses visid_incap_*, AWS WAF returns awsalb

Log the WAF identification immediately:

node ${CLAUDE_PLUGIN_ROOT}/scripts/target-intel.js add target.com defense waf-type "Cloudflare Business" --source wafw00f
node ${CLAUDE_PLUGIN_ROOT}/scripts/techniques-tracker.js add wafw00f target.com "waf-fingerprint" success --notes "Identified Cloudflare Business plan WAF"

Read the full file on GitHub · 284 lines

Files

What ships with it

6 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.

5d ago First seen · 284 lines · 520 tokens per session scan A 43f7e775f420

Subscribe to this mod's changes

waf-bypass is a skill published in the GitHub repository ogrodev/fsociety (20 stars, last pushed 5mo ago), licensed MIT. It adds 520 tokens to every session and 3,768 once invoked, about $0.0026 per session on Opus 5. A static security scan graded it A with 1 finding (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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