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Why the OWASP Top 10 is a starting point, not a testing plan
The OWASP Top 10 helps organize common web application risks. It does not tell you which features a particular program exposes, how its users and roles differ, or which business actions the application is supposed to permit. Treating it as a universal checklist can leave important application-specific behavior unexplored.
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This is not a reason to discard OWASP guidance. HackerOne’s Pentesting Methodology, published July 17, 2024, says its methods draw on OWASP Top 10, PTES, and OSSTMM principles and are tailored to the assessment. OWASP’s Web Security Testing Guide (WSTG) likewise presents adaptable testing guidance rather than a rigid sequence. Neither source establishes that one bug bounty workflow produces more valid findings than another. The method below is a disciplined way to apply recognized categories to the target in front of you, not a success-rate claim.
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Before reconnaissance, open the current program brief and identify what the program actually authorizes. Rules vary between programs and can change, so a general testing guide is not permission to test a particular asset or use a particular technique.
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- In-scope assets: Record the exact domains, applications, APIs, or other assets included. Do not assume a related hostname, third-party service, or mobile backend is covered.
- Prohibited activity: Check for restrictions on denial-of-service testing, social engineering, destructive actions, automated scanning, or access to other users’ data.
- Rate limits and safe testing: Note any limits on request volume and any rules for test accounts or production data.
- Reporting and disclosure: Find the required private reporting channel, confidentiality terms, and any publication restrictions.
OWASP’s Vulnerability Disclosure Cheat Sheet warns that testing outside a program’s scope and rules can create legal risk. OWASP Foundation’s program brief says to test only listed assets and not to access, copy, or change data that is not yours. When in doubt, pause and ask the program through its stated channel rather than infer permission.
Map the application before choosing tests
Reconnaissance should produce a working model of the application, not just a hostname list. OWASP’s WSTG Information Gathering Overview puts the point plainly: “You can only test what you can find.” Use the product normally, within scope, and note what it lets each account do.
- Inventory the in-scope surface. List the authorized hosts and the application areas you can reach, such as account settings, team administration, billing, file sharing, or support workflows. Keep out-of-scope assets separate.
- Identify roles and account states. Note whether the product distinguishes ordinary users, administrators, invited members, or unauthenticated visitors. Record what each test account is allowed to do.
- Trace meaningful workflows. Follow multi-step actions, such as creating an invitation, changing an account setting, or submitting a request. Observe which screens, endpoints, and state changes belong to each step.
- Keep a request map. For relevant requests, record the endpoint, method, parameters, authentication state, and observed response. Sanitize secrets in your notes and never retain unnecessary personal data.
Focus on features where different users, roles, or workflow steps may lead to different outcomes. A map makes gaps visible: for example, a feature may have a user-facing page and an API action, or a multi-step process may include a final action that needs its own authorization check.
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Turn observed behavior into focused tests
For each workflow, write down what should happen, who should be able to do it, and what must remain true at each step. Then select the relevant security category and test only within the program’s allowed limits. The question is not simply “Does this input trigger a familiar error?” It is “Does this action cross a boundary the application is supposed to enforce?”
| What you observed | Useful test question | What to verify |
|---|---|---|
| A record or action belongs to one account | Can a second account with the same role access or change it? | Whether access is correctly limited to the account entitled to the record or action. |
| The application has multiple roles | Can a lower-privilege role perform an action reserved for a higher-privilege role? | Whether the server enforces role permissions, rather than relying only on hidden controls in the interface. |
| A task has several steps | Can a required step be skipped, repeated, or reached in the wrong order? | Whether the server maintains the workflow’s required state and rules. |
| A function is intended to have usage limits | Can the function be used more often than the product’s rules allow? | Whether the limit is enforced as specified, using only tests the program permits. |
These questions reflect scenarios in the OWASP WSTG, including comparing access for two same-role accounts, checking role permissions, testing workflow circumvention, and checking limits on how often a function can be used. They are prompts for application-specific testing, not permission to access another person’s account or data. Avoid broad payload testing or automated checks unless the program explicitly allows them.
Validate a suspected issue without expanding the harm
A surprising response, identifier, or error message is a lead, not proof of a vulnerability. Establish a minimal, reproducible chain: the in-scope feature, the account or role used, the allowed action, the result, and why that result violates the application’s expected boundary.
- Reproduce the behavior using accounts and data you control, where possible.
- Confirm that the result is not expected behavior or an effect blocked by a meaningful mitigation.
- Use the least intrusive proof needed to establish impact. Do not browse, copy, or modify another person’s data to make a report look stronger.
- Stop if proving the issue would require an action the program prohibits or would create unnecessary risk; explain the limit in your report.
OWASP Foundation advises researchers not to access, copy, or change data that is not theirs. A defensible report distinguishes what you observed from what you infer, and describes the practical effect without inflating severity.
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Write a report a triager can reproduce
A useful report lets the program understand the affected boundary and repeat the behavior without guessing. HackerOne’s Code of Conduct says reports must be “accurate, reproducible, and demonstrate real-world impact.” OWASP’s Vulnerability Disclosure Cheat Sheet calls for sufficient details to understand and reproduce the vulnerability, and recommends redacting personal data.
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- Identify the affected asset and feature. Use the exact in-scope host or application area and describe the relevant workflow.
- State the issue and expected behavior. Explain whose action or data should be protected and what the application did instead.
- Give numbered reproduction steps. Include the account roles or states needed, the actions taken, and the observable result. Keep the steps minimal.
- Attach sanitized evidence. Include relevant request and response details or a proof of concept when appropriate. Remove credentials, tokens, and personal data that are not needed to verify the issue.
- Explain practical impact and limits. Describe what an attacker in the demonstrated position could do, what access is required, and any mitigations that reduce the impact. Separate demonstrated effects from possibilities you have not tested.
Report privately and follow the program’s process
Submit through the channel named in the program brief, keep the report confidential while it is triaged, and respond professionally to reasonable requests for clarification or reproduction details. OWASP recommends private initial reporting and ongoing professional communication. Program-specific policies govern whether, when, and how public disclosure may happen, so do not assume that submitting a report grants permission to publish it.
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