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Introduction:
In an intense two-day live hacking showdown at leHACK 2026 in Paris, YesWeHack and PUMA Group challenged the world’s top ethical hackers to tear apart undisclosed digital assets – with prize money, prestige, and leaderboard dominance on the line. This high-stakes competition exemplifies how crowdsourced security testing is revolutionizing vulnerability discovery, as elite hunters compete in real-time to uncover critical flaws before malicious actors can exploit them. The final leaderboard now stands as a testament to the power of collaborative offensive security.
Learning Objectives:
- Understand the structure and mechanics of professional Live Hacking Events (LHEs) and how they differ from traditional penetration testing.
- Learn the key vulnerability categories (IDOR, improper access control, injection flaws) that consistently win bug bounty competitions.
- Master practical reconnaissance, exploitation, and reporting techniques used by top-ranking ethical hackers.
You Should Know:
- Live Hacking Event (LHE) Methodology: From Zero to Pwn
Live Hacking Events are time-boxed, in-person competitions where ethical hackers converge to test specific digital assets. Unlike standard bug bounty programs that run indefinitely, LHEs condense the discovery process into an intense sprint – typically 48 hours. The target company and scope remain secret until launch, forcing hunters to adapt rapidly.
Step-by-step guide to participating in an LHE:
- Pre-Event Preparation: Register for the conference (e.g., leHACK), create a YesWeHack account, and complete verification steps. Familiarize yourself with the platform’s submission workflow.
- Scope Revelation: At the event, connect to venue Wi-Fi, log in to your YesWeHack account, and navigate to `yeswehack.com/programs` to access the exclusive program.
- Reconnaissance Phase (Day 1): Map the attack surface. Use tools like
nmap,subfinder, and `amass` to enumerate subdomains and exposed services. For example:Linux - Subdomain enumeration subfinder -d target.com -o subdomains.txt amass enum -d target.com -o amass_output.txt
Windows - Port scanning with PowerSploit Import-Module .\PowerSploit.psm1 Invoke-PortScan -StartAddress 192.168.1.1 -EndAddress 192.168.1.254 -ResolveHost -ScanPort
- Active Testing (Day 2): Intercept traffic using Burp Suite or Caido. Probe for OWASP Top 10 vulnerabilities: SQLi, XSS, IDOR, CSRF, and broken authentication.
- Submission & Triage: Submit findings through the YesWeHack platform. The platform’s triage team enriches each report with technical details (affected assets, endpoints, payloads, authentication context).
- Collaboration & Social Engineering: Engage with other hunters and the partner’s security team – sometimes the most critical insights come from hallway conversations.
2. Winning Bug Classes: What Top Hunters Exploit
The winners – Pierre MARTIN, Arthur Deloffre, swdb, and Florian – demonstrated mastery over specific vulnerability types. Based on interviews with top hunters like Aituglo (ranked on YesWeHack’s all-time leaderboard), the most impactful bugs often involve:
- IDOR (Insecure Direct Object References): Chaining IDORs with improper access controls can lead to account takeover. Aituglo famously reset every password in a major medical company by chaining IDOR vulnerabilities.
- Business Logic Flaws: These bypass traditional security controls by exploiting the application’s intended workflow.
- Authentication & Session Management: Weak JWT secrets, misconfigured OAuth flows, and session fixation.
Step-by-step guide to testing for IDOR:
- Intercept a request that accesses a resource by ID (e.g.,
GET /api/user/1234/profile). - Change the ID to another user’s ID (e.g.,
GET /api/user/5678/profile). - If the response returns another user’s data without proper authorization checks, you’ve found an IDOR.
- Chain this with a password reset function to achieve full account takeover.
3. Tooling & Environment Setup for Live Hacking
Top hunters rely on a combination of commercial tools, custom scripts, and open-source frameworks. Aituglo, a former developer, builds his own plugins for Caido and writes custom scripts to automate reconnaissance.
Essential tool stack:
- Proxy: Burp Suite (industry standard) or Caido (lightweight, underrated alternative).
- Recon:
subfinder,amass,httpx,waybackurls. - Exploitation:
sqlmap,xsstrike, `ffuf` (fuzzing). - Custom Scripting: Python with `requests` and `beautifulsoup4` libraries.
Linux command to automate endpoint discovery:
cat subdomains.txt | httpx -silent -o alive.txt cat alive.txt | waybackurls | grep -E ".js|.json|.php|.asp" | sort -u > endpoints.txt
Windows PowerShell script to check for common misconfigurations:
$urls = Get-Content .\alive.txt
foreach ($url in $urls) {
try {
$response = Invoke-WebRequest -Uri "$url/.git/config" -ErrorAction Stop
if ($response.StatusCode -eq 200) {
Write-Host "[bash] .git exposed: $url"
}
} catch {}
}
4. The YesWeHack Triage & Reporting Workflow
Submitting a vulnerability is only half the battle – the report must be clear, reproducible, and impactful. YesWeHack employs a structured six-step triage workflow:
- Metadata Enrichment: The platform automatically adds technical details (endpoints, payloads, environments).
- Validation: YesWeHack determines the probability of validity. Low-probability reports enter pre-triage.
- Reproducibility: The triage team attempts to replicate the issue.
4. Severity Scoring: Using CVSS and business impact.
5. Notification: The organization is alerted.
- Resolution & Reward: Bounties are paid based on severity and impact.
Step-by-step guide to writing a winning report:
- Concise and descriptive (e.g., “IDOR in /api/v1/orders allows viewing other users’ order details”).
- Description: Explain the vulnerability, affected endpoints, and potential impact.
- Steps to Reproduce: Provide clear, numbered steps with actual requests/responses.
- Proof of Concept (PoC): Include screenshots, code snippets, or cURL commands.
- Impact: Quantify the business risk (e.g., “Exposes PII of 10,000+ users”).
- Mitigation: Suggest fixes (e.g., “Implement proper authorization checks using user session tokens”).
5. Cloud & API Security Hardening for Enterprises
For organizations like PUMA Group, securing cloud-1ative and API-driven architectures is paramount. YesWeHack’s platform integrates with API security testing, and their bug bounty programs often cover complex, multi-agent architectures.
Key hardening measures:
- API Gateways: Implement rate limiting, authentication (OAuth2/JWT), and input validation.
- Cloud Misconfigurations: Regularly audit S3 buckets, IAM roles, and security groups.
- Secrets Management: Use HashiCorp Vault or AWS Secrets Manager – never hardcode credentials.
Linux command to audit S3 bucket permissions:
aws s3api get-bucket-acl --bucket your-bucket-1ame aws s3api get-bucket-policy --bucket your-bucket-1ame
Windows command to check for exposed Kubernetes secrets:
kubectl get secrets --all-1amespaces -o yaml | findstr "apiVersion"
6. The Human Element: Collaboration & Mindset
Beyond technical skills, successful hackers exhibit persistence, creativity, and a community-driven mindset. Aituglo emphasizes that “being persistent on the target, and taking a lot of time” is crucial – you might not find a bug on day one, but a week later, you could strike gold.
Key mindset shifts for aspiring hunters:
- Think Like a Developer: Understand how applications are built to predict where bugs hide.
- Embrace Failure: Each failed attempt refines your methodology.
- Collaborate: “Hacker houses” – where friends gather to hack together – foster creativity and knowledge sharing.
What Undercode Say:
- Key Takeaway 1: Live Hacking Events are not just about finding bugs – they’re about building relationships between security teams and the ethical hacker community, fostering a culture of proactive defense.
- Key Takeaway 2: The winners’ success underscores the value of chaining multiple low-severity issues into a critical exploit – a technique that requires deep understanding of application logic and creative thinking.
- Analysis: The PUMA Group LHE demonstrates that crowdsourced security is scalable and effective. With YesWeHack’s platform processing thousands of submissions, the triage workflow ensures that only validated, high-impact vulnerabilities reach the organization. The event also highlights the growing trend of AI-powered testing, where traditional infrastructure and AI systems are both in scope. As attack surfaces expand, so does the need for continuous, human-in-the-loop testing. The collaboration between YesWeHack (135,000+ hackers) and enterprises like PUMA sets a benchmark for modern offensive security. The inclusion of a “Payload Plz Reloaded” challenge – where a single payload must compromise multiple systems – gamifies the learning process and encourages precision over brute force.
Prediction:
- +1 The success of this event will accelerate adoption of Live Hacking Events among major brands, particularly in retail and finance, driving a new wave of proactive security investments.
- +1 AI-assisted triage and vulnerability validation will become standard, reducing turnaround times from days to hours, making bug bounty programs even more attractive to enterprises.
- -1 As LHEs grow in popularity, the competition for top-tier hackers will intensify, potentially driving up bounty costs and creating a talent bottleneck.
- -1 The “secret scope” model may face scrutiny if organizations fail to adequately prepare their assets, leading to unintended exposure of sensitive data during events.
- +1 The gamification elements (leaderboards, swag, challenges) will inspire a new generation of ethical hackers, expanding the talent pool and strengthening global cybersecurity resilience.
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