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Bug bounty platforms like Bugcrowd and HackerOne are essential for cybersecurity researchers to identify and report vulnerabilities. Jonas Dias Rebelo, a seasoned penetration tester, recently discovered a vulnerability in a U.S. Department of Defense program hosted on Bugcrowd—despite primarily using HackerOne. His experience highlights the importance of cross-platform research and scope management.
You Should Know:
1. Scope Mismanagement Can Lead to Discoveries
Jonas found a Bugcrowd vulnerability while filtering scopes on HackerOne. This shows that improperly configured searches can reveal hidden attack surfaces.
Example Command (Linux):
Use grep to filter scope files across multiple platforms grep -r "Department of Defense" ~/bugbounty/scopes/
2. Cross-Platform Reconnaissance
Many programs exist on both Bugcrowd and HackerOne. Recon across both to maximize findings.
Tools & Commands:
Use Amass for subdomain enumeration amass enum -d target.com -config config.ini -o subdomains.txt Use httpx to check live hosts cat subdomains.txt | httpx -silent -status-code -title
3. Automating Scope Comparison
Compare scope files between platforms to identify overlaps.
Python Script Example:
import difflib
with open('hackerone_scope.txt', 'r') as h1:
h1_scope = h1.readlines()
with open('bugcrowd_scope.txt', 'r') as bc:
bc_scope = bc.readlines()
diff = difflib.unified_diff(h1_scope, bc_scope)
print(''.join(diff))
4. Reporting & Avoiding Duplicates
Bugcrowd programs often suffer from duplicate reports due to slow fixes. Verify if a bug is already reported before submission.
Command to Check Bug Status (Using API):
curl -X GET "https://api.bugcrowd.com/v1/bugs" -H "Authorization: Token YOUR_API_KEY"
- Pro Tip: Use Wayback Machine for Historical Data
waybackurls target.com | grep ".js$" | httpx -status-code -mc 200
What Undercode Say:
Bug hunting requires persistence, automation, and sometimes luck. Cross-checking platforms like Bugcrowd and HackerOne increases the chances of finding unique vulnerabilities. Always document scope changes and automate reconnaissance to stay ahead.
Expected Output:
- A list of live subdomains (
subdomains.txt) - Diff results between HackerOne and Bugcrowd scopes
- API-based bug status checks
- Wayback Machine archived endpoints
Prediction:
As bug bounty programs grow, automated recon and AI-driven vulnerability detection will become standard, reducing duplicates and improving triage efficiency.
Relevant URLs:
IT/Security Reporter URL:
Reported By: Jonasdiasrebelo Bugbountylife – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
