Application security testing
Red team hackathons for practical AppSec, purple teaming and secure coding
Internal hackathons can turn security testing into a structured, collaborative exercise that helps teams find product-specific vulnerabilities, strengthen offensive security thinking and improve secure engineering culture beyond a standard penetration test.
As a cyber security consultant, I have overseen security testing practices and coordinated penetration tests to help ensure applications remain secure after major updates. Traditional tests are valuable, especially when they assess common vulnerability classes such as the OWASP Top 10, but they can still miss weaknesses that only appear when someone understands the product deeply and interacts with it in unexpected ways.
That is where an internal red team hackathon can be useful. It gives developers, security teams and approved participants a structured way to look for vulnerabilities in a controlled environment, while creating a practical learning loop between offensive security testing, defensive improvement and secure development.
Practical takeaway: A red team hackathon works best when it is scoped like a security test, run like a collaborative challenge and closed out like a vulnerability management exercise.
Why use hackathons for red team security testing?
Internal hackathons introduce play into security testing without removing structure. They allow teams to test business logic, unusual user journeys, access control assumptions, workflow abuse cases, product-specific edge cases and insecure coding patterns that a short external engagement may not have time to explore in depth.
They use product knowledge
Developers and internal teams understand how the application is meant to behave, where shortcuts exist and which flows are most fragile.
They build security culture
Security becomes practical, visible and collaborative rather than something that only appears during audits or penetration tests.
They support purple teaming
Offensive discovery, defensive learning and remediation planning happen close together, which helps teams improve faster.
The application security testing gap
There is often a knowledge gap between developers and external penetration testers. Developers know the application, but may not have the objectivity or offensive testing mindset to challenge it fully. External testers bring independence and specialist skill, but may not have enough time to understand every business rule, legacy design decision or product-specific workflow.
A red team hackathon helps bridge that gap. It does not remove the need for independent penetration testing, secure SDLC controls, code review, threat modelling or vulnerability scanning. Instead, it adds a practical layer of collaborative application security testing that uses internal knowledge more deliberately.
| Testing method | Strength | Common limitation | Where hackathons help |
|---|---|---|---|
| Penetration testing | Independent assessment by specialist testers. | Often time-boxed and focused on agreed scope or common vulnerability classes. | Internal teams can explore product-specific logic and edge cases over repeated events. |
| Automated scanning | Scales across code, dependencies and infrastructure. | May miss business logic, chained weaknesses and contextual risk. | Participants can test how weaknesses behave in real workflows. |
| Developer testing | Uses deep knowledge of the codebase and architecture. | Can be biased by assumptions about intended use. | A challenge format encourages people to think like attackers and abuse normal flows. |
| Red team exercise | Tests realistic attack paths and organisational response. | May focus on broader objectives rather than one application or codebase. | A hackathon can focus offensive thinking on a specific product, release or control area. |
What is a red team hackathon?
A red team hackathon is a structured internal security testing event where approved participants attempt to identify vulnerabilities, abuse cases or risky behaviours in an agreed test environment. It borrows from red teaming, bug bounty hunting and purple teaming, but keeps the scope, rules and remediation process under organisational control.
The format can work well for application security testing, API security, access control, cloud configuration review, secure coding education and post-release hardening. The aim is not to create chaos. The aim is to give teams a safe way to think offensively, find weaknesses and learn how to fix them.
Red team value
Participants are encouraged to think about abuse paths, privilege boundaries, unexpected user behaviour, weak assumptions and how issues could be chained together.
Purple team value
Findings are turned into shared learning, better detection, improved engineering practices, clearer remediation and more informed vulnerability management.
How to run an internal security hackathon
A useful internal bug bounty or security hackathon needs more than enthusiasm. It needs scope, rules, environment readiness, legal and policy boundaries, safety controls, judging criteria, reporting templates and a clear route into remediation.
Choose the objective
Decide whether the event is focused on AppSec, APIs, access control, business logic, cloud misconfiguration, secure coding or post-release hardening.
Define the scope
Set the applications, environments, test accounts, attack types, exclusions and time limits. Make it clear what is in and out of bounds.
Prepare the environment
Use a safe test environment that mirrors the relevant production behaviour without exposing live customer data or critical services.
Brief participants
Explain the rules of engagement, reporting format, scoring approach, reward model and expected conduct before testing begins.
Triage findings
Validate reports, remove duplicates, assess severity, capture evidence and route issues into vulnerability management or engineering backlog.
Close the loop
Share outcomes, reward good findings, fix root causes and use trends to improve secure coding guidance and future testing scope.
Rules of engagement for a security hackathon
Clear rules of engagement keep the event safe, fair and useful. Participants should know what they are allowed to test, what data they must not access, how to report findings and when to stop.
| Rule area | What to define | Why it matters |
|---|---|---|
| Scope | Applications, APIs, test accounts, environments, user roles and excluded systems. | Prevents accidental testing of production, third-party systems or sensitive areas. |
| Data handling | No live customer data, no unnecessary extraction, no screenshots of sensitive information unless approved. | Protects privacy, confidentiality and regulatory obligations. |
| Attack limits | Whether denial of service, social engineering, phishing, persistence, malware or destructive testing are prohibited. | Keeps the exercise safe and proportionate. |
| Reporting | Evidence required, reproduction steps, impact, affected asset, suggested severity and suspected root cause. | Makes findings easier to validate and remediate. |
| Rewards | How duplicates, severity, quality of write-up and team submissions will be judged. | Creates fairness and encourages useful reports rather than noisy submissions. |
How to manage hackathon findings
The value of a red team hackathon is not the number of bugs found on the day. The value comes from what happens next: validation, prioritisation, remediation, root cause analysis, control improvement and shared learning.
A finding is not finished when it is discovered. It becomes valuable when it is understood, prioritised, fixed, retested and used to prevent similar weaknesses elsewhere.
Capture each finding properly
- Affected application, API, endpoint, role or workflow.
- Steps to reproduce and proof of concept evidence.
- Business impact and possible abuse scenario.
- Suggested severity, exploitability and likelihood.
- Reporter, date, duplicate status and triage decision.
Route findings into remediation
- Create tickets with owners and due dates.
- Map findings to vulnerability management and risk processes.
- Identify recurring secure coding or design weaknesses.
- Retest fixes before closure.
- Share lessons with developers and security champions.
Lessons learned from running an internal bug bounty hackathon
When planning the hackathon, I expected engineering teams to find bugs outside of what would usually appear in a penetration testing engagement. The outcome was stronger than expected because the event did more than identify vulnerabilities. It revealed how people thought about security, where development practices needed support and how much curiosity existed across the organisation.
- Non-technical employees were interested, creating an opportunity to champion cyber security outside technical teams.
- Preparation mattered. Uncompiled code, incomplete environments and missing instructions reduced useful testing time.
- Financial rewards were a strong incentive and helped position findings as valuable contributions.
- Vulnerabilities found during the event highlighted recurring secure coding patterns that needed broader improvement.
- Some technical employees showed strong security interest, creating opportunities to develop security champions and future AppSec talent.
Metrics to track after the hackathon
Track enough data to understand whether the exercise improved security testing, secure engineering and risk visibility. The metrics should help leadership, engineering and security teams see what changed.
| Audience | Useful metrics | Decision supported |
|---|---|---|
| Board and executives | Critical and high findings, risk reduction, recurring themes, remediation progress and investment needs. | Where to invest in AppSec, secure coding tools, training or additional testing. |
| Engineering leaders | Finding types, affected components, mean time to remediate, duplicate patterns and secure coding gaps. | Which teams, code areas or practices need improvement. |
| Security and risk teams | Attack paths, control gaps, vulnerable workflows, remediation status and residual risk. | How to prioritise vulnerability management, risk treatment and future testing scope. |
| Security champions | Participation, quality of submissions, lessons learned and training opportunities. | How to build sustainable security culture and internal capability. |
Common mistakes to avoid
Running it without scope
A hackathon without clear scope can create unsafe testing, poor evidence and findings that are hard to compare.
Using production data
Testing should avoid live customer data and business-critical environments unless the exercise has been formally designed for that level of risk.
Rewarding noise
Reward quality, severity, clarity and valid impact rather than the number of low-value submissions.
Skipping remediation
The event loses credibility if issues are discovered but not triaged, fixed, retested or communicated.
Ignoring learning
Findings should shape secure coding guidance, threat modelling, awareness training and future testing.
Positioning it as a blame exercise
The tone matters. The goal is better security, not public embarrassment for teams that built vulnerable code.
Related Karimah.co.uk resources
Security testing only creates lasting value when findings feed into governance, engineering decisions and leadership visibility. These resources can help connect testing activity to broader security improvement.
Red team hackathon FAQs
What is a red team hackathon?
A red team hackathon is a structured security testing event where approved participants use offensive thinking to identify vulnerabilities, abuse cases and risky behaviours in a defined application, API, product or environment.
How is a red team hackathon different from penetration testing?
Penetration testing is usually performed by specialist testers against an agreed scope. A red team hackathon is more collaborative and can involve internal developers, security teams and selected participants who bring product knowledge and test unusual workflows or business logic.
How do hackathons support purple teaming?
Hackathons support purple teaming by bringing offensive discovery, defensive learning and remediation planning together. Participants find weaknesses, defenders understand the attack path and engineering teams learn how to fix and prevent similar issues.
Can an internal bug bounty replace a public bug bounty programme?
No. An internal bug bounty or hackathon is usually a controlled first step. It can help improve security maturity before an organisation considers a wider public or private external bug bounty programme.
What vulnerabilities can security hackathons find?
They can uncover access control weaknesses, business logic flaws, insecure direct object references, authentication issues, authorisation gaps, API misuse, insecure configuration, data exposure and recurring secure coding mistakes.
Who should participate in a security hackathon?
Participants may include developers, testers, security engineers, product owners, security champions and selected non-technical staff. The right mix depends on the scope, sensitivity and rules of engagement.
What should happen after the hackathon?
Findings should be validated, de-duplicated, prioritised, assigned to owners, remediated, retested and analysed for trends. Lessons should feed into secure coding guidance, AppSec processes and future security testing.
Need help planning a red team hackathon or AppSec testing sprint?
I can help you define scope, structure the rules of engagement, prepare the test environment, design the reporting process and make sure findings flow into vulnerability management, secure coding improvements and leadership reporting.