Bug Bounty Hunting: How to Find Vulnerabilities and Get Paid for Ethical Hacking

Bug bounty programs pay ethical hackers to find and report security vulnerabilities in companies' systems. Top bug bounty hunters earn six figures annually, and the field is open to anyone with the skills — no degree, no certifications, no job application required.

This lesson teaches you how to start bug bounty hunting: choosing programs, building your methodology, finding real bugs, and writing reports that get paid.

Bug Bounty Hunting: Getting started: platforms and programs

The major bug bounty platforms that connect hunters with companies:

• HackerOne (hackerone.com) — largest platform. Programs from Google, GitHub, Uber, and thousands more.
• Bugcrowd (bugcrowd.com) — second largest. Strong in IoT and hardware.
• Intigriti (intigriti.com) — European focus. Growing rapidly.
• YesWeHack (yeswehack.com) — European platform with good programs.

Start with programs that have a wide scope, a public disclosure policy, and a responsive security team. Programs labeled 'beginner-friendly' or with a large number of resolved reports are good first targets.

Bug bounty methodology: finding real vulnerabilities

A systematic methodology beats random testing every time:

# Phase 1: Reconnaissance (30-50% of time)
# - Subdomain enumeration (subfinder, amass, crt.sh)
# - Technology fingerprinting (Wappalyzer, WhatWeb)
# - JavaScript analysis (find hidden API endpoints)
# - Parameter discovery (Arjun, ParamSpider)
# - Content discovery (ffuf, dirsearch)

$ subfinder -d target.com | httpx -silent > live-hosts.txt
$ cat live-hosts.txt | while read url; do
  echo "--- $url ---"
  whatweb "$url" 2>/dev/null
done

# Phase 2: Map the attack surface
# - List all features: login, search, upload, API, payments
# - Identify user roles: guest, user, admin, API consumer
# - Note input points: forms, URL params, headers, file uploads

# Phase 3: Test each feature against vulnerability classes
# Priority order (by bounty payout):
# 1. SSRF (server-side request forgery)
# 2. Authentication bypass / IDOR
# 3. SQL injection
# 4. Remote Code Execution
# 5. XSS (stored > reflected > DOM)
# 6. Business logic flaws
# 7. Information disclosure

# Phase 4: Verify and document
# - Reproduce 3 times minimum
# - Document every step with screenshots
# - Assess real-world impact

Writing reports that get paid

Your report is your product. A well-written report gets paid faster and at higher bounties. A poorly written report gets duplicated or marked as informational.

## Title
Stored XSS in user profile bio field allows session hijacking

## Severity
High (CVSS 7.1) — affects all users who view the attacker's profile

## Description
The user profile bio field does not sanitize HTML input. An attacker
can inject JavaScript that executes in the browser of any user who
views the profile page.

## Steps to Reproduce
1. Log in to https://target.com
2. Navigate to Settings → Profile
3. In the Bio field, enter: <img src=x onerror=alert(document.cookie)>
4. Save the profile
5. Open the profile page in a different browser/session
6. The alert fires, showing the viewer's session cookie

## Impact
An attacker can:
- Steal session cookies and impersonate any user
- Modify other users' account settings
- Spread the payload to more profiles (worm)
- Redirect users to phishing pages

## Proof of Concept
[Screenshot of alert with cookie]
[Video of full exploitation chain]

## Remediation
- HTML-encode all user input before rendering in the bio field
- Implement a Content Security Policy to prevent inline scripts
- Add HttpOnly flag to session cookies

Common mistakes and tips for beginners

Avoid these common beginner mistakes:

• Testing out of scope — read the program policy carefully. Testing domains, methods, or vulnerability types not in scope can get you banned.
• Submitting low-quality reports — 'I found XSS' with no steps to reproduce wastes everyone's time. Include full reproduction steps and impact.
• Chasing only easy bugs — everyone tests the login page. Go deeper: look at APIs, mobile endpoints, third-party integrations, and business logic.
• Giving up too soon — most hunters submit 10-20 reports before their first paid bounty. The learning curve is steep but the rewards are worth it.

Tips: specialize in one vulnerability type first, read disclosed reports on HackerOne for inspiration, join the bug bounty community (Discord, Twitter), and practice on CTFs between real hunting sessions.

When evaluating bug bounty hunting, start with the fundamentals: what problem it solves, who it serves, and how it compares to the alternatives buyers consider first.

Start with the fundamentals. Define who you are serving, the single outcome you want, and the budget you are comfortable committing before you compare any options.

A practical rule is to favour clarity over cleverness. The choice that is easiest to understand, spell, remember and act on tends to win over the long run.

Context changes the answer. What is optimal for a fast-moving startup is rarely optimal for an established brand, so weigh your own stage, market and ambitions.

Avoid the common mistakes: rushing the decision, copying competitors blindly, and ignoring the total cost of ownership beyond the very first year of use.

Think in terms of trade-offs rather than a single perfect answer. Every option trades memorability, cost, reach and flexibility in a slightly different mix.

Document your reasoning. Writing down why you chose one path makes it far easier to revisit the decision later and to explain it to partners and investors.

Test with real people. A quick check with a handful of your actual customers will surface problems that no amount of internal debate ever reveals.

Plan for growth. The option that fits today should still make sense when your audience, catalogue or team is several times larger than it is right now.

Finally, revisit the decision periodically. Markets, tools and best practices move quickly, and a choice that was ideal last year may deserve a fresh look today.

When evaluating bug bounty hunting, start with the fundamentals: what problem it solves, who it serves, and how it compares to the alternatives buyers consider first.

Frequently asked questions

How much can I earn from bug bounties?

Bounties range from $50 for low-severity findings to $100,000+ for critical vulnerabilities. The average full-time bug bounty hunter earns $50,000-$100,000/year. The top 1% earn $300,000+. Most hunters earn nothing for the first few months while learning.

Do I need certifications to start bug bounty hunting?

No certifications are required. Companies care about results (valid bug reports), not credentials. However, learning structured material (like this course) gives you a methodology that random YouTube videos do not. Certifications help for traditional employment but not for bounty hunting.