The Tool Desk
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What a repeatable reconnaissance workflow actually does
Reconnaissance is not a race to collect the largest possible list of domains. Its purpose is to identify useful, testable attack surface while keeping every action tied to a program’s current authorization. A repeatable process gives you the same decision points every time, so you can tell the difference between a discovered asset and an eligible target, between an observation and a vulnerability, and between a safe validation step and an activity that could damage a service.
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A practical cycle has four broad phases: reconnaissance, enumeration, exploitation or validation, and documentation. An Atlassian/Bugcrowd engagement report published in April 2024 presents those phases as an organizing model while noting that researchers use their own methodologies. Treat the model as a way to structure work, not as permission to perform any phase on an unauthorized system.
- Reconnaissance: collect information using methods the program allows.
- Enumeration: turn observations into a structured list of hosts, applications, endpoints, identities or technologies.
- Validation: confirm whether a suspected issue is real, in scope and safe to demonstrate.
- Documentation: preserve timestamps, steps, evidence, impact and the submission trail.
The output of each phase should be usable by the next one. If you cannot explain why an asset is eligible, what rule permits a test, or how a result can be reproduced safely, stop and resolve that uncertainty before continuing.
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1. Choose an authorized program before collecting data
Start with a current vulnerability disclosure or bounty program, not with a company name or a domain discovered elsewhere. Read the program brief before opening tools. Bugcrowd describes its brief as the place where targets, goals, scope, expectations, rewards and rules are defined, and its researcher documentation advises reviewing the brief before beginning.
Program pages on platforms such as HackerOne and Bugcrowd are useful starting points because they expose target details and reporting instructions, but the platform name does not override the individual program’s terms. A program can define several target groups, each with different technologies, restrictions and reward ranges.
Questions to answer on the program page
- Which organization or legal entity operates the program?
- Which hostnames, mobile applications, APIs, IP ranges or repositories are explicitly in scope?
- Which vulnerability classes are eligible, excluded or considered informational?
- Are automated scanners, crawling, fuzzing, brute force, password testing or rate-intensive requests restricted?
- Are production systems separated from staging, test or development systems?
- Is a supplied test account required, and are there rules for creating or naming accounts?
- What evidence and reproduction format does the program require?
- Which channel must receive the report, and what disclosure restrictions apply?
- What are the target-specific reward ranges and response expectations?
Do not infer authorization from ownership, a shared parent company, a similar hostname or a certificate. A neighboring domain may belong to the same organization and still be out of scope.
2. Create a scope record you can consult while testing
Before any interaction, make a small record for the specific program. The record is a working control, not a substitute for the official brief. Preserve the URL or program identifier, the date and time checked, and the exact wording needed to interpret restrictions.
| Record section | What to capture | Why it matters |
|---|---|---|
| Program identity | Program name, official page and reporting channel | Prevents a finding from being sent to the wrong process |
| Scope snapshot | Every named asset, asset type and target-specific condition | Connects each test to an explicit authorization |
| Exclusions | Out-of-scope assets, vulnerability classes, data and actions | Stops accidental testing of prohibited systems or issues |
| Technique rules | Allowed discovery methods, automation limits, rate limits and account requirements | Defines how reconnaissance may be performed |
| Evidence rules | Proof-of-concept expectations, sensitive-data handling and disclosure policy | Guides safe validation and reporting |
| Change control | Last review time, update notices and the next review due | Shows which version of the rules governed the work |
| Work status | Passive notes, active notes, pending assets, findings and submission status | Keeps observations and authorized actions separate |
HackerOne’s asset documentation notes that most programs define eligible assets individually, with each URL carrying its own rules. Bugcrowd likewise separates in-scope and out-of-scope target groups. Record those distinctions rather than collapsing them into a single “company assets” list.
3. Recheck the rules before every work session
Scope is time-sensitive. Open the program page and its update history before starting a new session, even if you worked on the same target yesterday. Bugcrowd’s researcher documentation describes program updates and notifications for changes such as new targets or exclusions.
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- Open the live program brief, not a saved copy alone.
- Compare targets, exclusions, testing rules and reward eligibility with your last record.
- Note any changed hostname, path, account requirement, rate limit or disclosure instruction.
- Mark the previous scope snapshot as historical and create a new timestamped version.
- Pause work that depends on a changed rule until you understand the new boundary.
If a target disappears from the brief, stop testing it and preserve your existing notes. If a new asset appears, treat it as newly authorized only from the time and conditions stated in the update.
4. Separate passive collection from active interaction
Your notes should make passive and active work visibly different. Passive collection can include information made available by the program, public documentation, search-engine results, certificate records or other sources, but the program may still restrict how those sources are accessed. Active interaction sends traffic to a target and therefore needs a direct rule permitting it.
Passive work checklist
- Use the program’s named assets as the starting set.
- Record the source, collection time and confidence for each observation.
- Keep third-party references and related domains in a “pending authorization” list.
- Do not turn a historical hostname, certificate entry or public link into an approved target automatically.
Active work checklist
- Confirm that the exact host, path, API or application is in scope.
- Confirm that the method is allowed, including automation and request rate.
- Use the supplied account pattern and test data rules.
- Set conservative limits before starting and monitor responses.
- Stop immediately if the target becomes unstable or performance degrades.
A checklist of common tools or techniques never grants permission. If the brief does not state whether a scan, crawl, fuzzing run or test against a newly found host is allowed, ask the program for clarification or do not perform it.
5. Enumerate without confusing discovery with authorization
Enumeration expands your understanding of an authorized target. It may reveal additional hostnames, virtual paths, API routes, parameters, applications, technologies or identity flows. Keep two lists throughout the process:
- Discovered assets: anything you observed or inferred.
- Authorized assets: items the current brief explicitly permits you to test.
An item remains in the first list until it is confirmed in the second. Do not probe a newly discovered host merely because it appears to be owned by the organization. HackerOne’s open-scope concept is tied to assets confirmed as owned by the organization; that concept should not be generalized to a program with a defined target list.
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- Copy the candidate asset exactly, including scheme, hostname, port or path.
- Search the current brief for an exact match or an explicitly defined wildcard.
- Check whether the asset belongs to a target group with extra restrictions.
- Check whether the observed service is a third party or a shared provider excluded by the brief.
- If any answer is uncertain, move the item to “awaiting authorization” and do not send active traffic.
This gate prevents a common error: producing an impressive asset inventory that contains very few legally or programmatically testable targets.
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6. Validate findings with the smallest safe action
Validation should answer a narrow question, not maximize impact. First establish that the behavior occurs on an in-scope asset. Then determine whether the behavior is reproducible, security-relevant and safe to demonstrate. Prefer a single controlled request, a harmless test value or a supplied account over broad automation.
Safety boundaries that apply unless the brief clearly says otherwise
- Do not attempt denial-of-service or load generation.
- Do not modify, delete or corrupt production data.
- Do not access another person’s private information beyond what is strictly necessary to establish the issue.
- Do not conduct social engineering, phishing or physical intrusion.
- Do not publish details or a proof of concept publicly.
- Do not continue an automated run when the target slows, errors or shows other degradation.
Bugcrowd’s standard disclosure terms state: “Testing should be performed only on systems listed under the program brief ‘Targets’ section. Any other systems are Out Of Scope.” The same terms say: “If you notice performance degradation on the target systems, you must immediately suspend all use of automated tools.” Those are standard terms; a specific program can add or modify requirements, so read the live brief first.
When a suspected issue involves sensitive data
Stop collecting once you have enough evidence to establish the behavior. Record the minimum necessary fields, redact secrets in local notes, and follow the program’s instructions for secure transfer. Do not copy data into screenshots, issue trackers or chat systems that the program did not authorize.
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7. Keep evidence reproducible and proportionate
A report is stronger when another analyst can reproduce the observation without guessing what you did. Capture the context at the time of testing, not days later from memory.
- Timestamp, timezone and session or request identifier where available
- Exact in-scope asset and affected component
- Account role and test-data conditions
- Minimal request and response details needed to reproduce the behavior
- Expected behavior and observed behavior
- Security impact explained in concrete terms
- What you did to avoid changing data or affecting availability
- Any limitations, intermittent behavior or assumptions
Keep raw evidence separate from the concise report narrative. Preserve hashes or immutable copies when appropriate, but do not retain unnecessary personal or confidential data.
8. Submit through the required channel and follow disclosure rules
Use the channel named by the program. Bugcrowd’s standard terms say submissions must be made through CrowdControl to qualify for reward under those terms, while individual program rules may differ. Submit a proof of concept when requested, but do not share it publicly unless the program explicitly permits disclosure.
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A concise report structure
- Title: identify the affected behavior and asset.
- Summary: explain the security condition in one or two sentences.
- Steps: provide numbered, reproducible actions using a test account or harmless data.
- Evidence: attach the minimum screenshots, requests, responses or logs required.
- Impact: describe what an attacker could do and which users or data could be affected.
- Mitigation context: mention boundaries, mitigations already observed or questions the program should investigate.
Track the submission status in the same program record, but do not assume a submitted report authorizes additional testing. Wait for the program’s response before expanding the test.
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A complete session procedure
The following procedure turns the principles into a repeatable start-to-finish routine.
- Select the program: open a current brief and confirm that it accepts the type of research you plan to perform.
- Snapshot scope: record assets, exclusions, methods, account rules, disclosure policy and the review timestamp.
- Choose a bounded objective: for example, map the documented API surface of one named host using only permitted requests.
- Collect passively: gather allowed public information and mark every item as discovered or authorized.
- Apply the authorization gate: remove or quarantine candidates that are not explicitly eligible.
- Run conservative enumeration: use only permitted automation, with low rates and clear stop conditions.
- Validate narrowly: reproduce a suspected behavior with the least invasive action that can establish impact.
- Record evidence immediately: save timestamps, exact assets, steps, observations and safety limitations.
- Report or close: submit through the required channel, or document why the observation is not actionable.
- Refresh before returning: check for program updates before the next session and version the record.
How to compare programs before committing time
Programs are not interchangeable. Compare the operating conditions, not only the headline reward.
| Comparison axis | Questions to ask |
|---|---|
| Asset scope | Are targets explicit, wildcard-based, open scope, or divided into groups? |
| Exclusions | Which hosts, data types, vulnerability classes and actions are excluded? |
| Techniques | Are scanning, crawling, fuzzing, brute force, mobile testing or social engineering restricted? |
| Automation | Are there rate limits, approval requirements or mandatory stop conditions? |
| Accounts | Is a test account supplied, or must you request one using a specific pattern? |
| Technology | Does the target type match your skills and available test environment? |
| Reporting | Which channel, evidence format and disclosure timeline apply? |
| Rewards | Are ranges target-specific, and are duplicates or informational reports excluded? |
| Updates | How are scope changes announced, and where is the update history shown? |
Bugcrowd’s brief guidance identifies targets, focus areas, excluded testing, additional rules and reward ranges as core parts of a program brief. A high reward cannot compensate for a target whose rules do not permit your intended method.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What’s wrong with my workflow?
If your reconnaissance produces many hosts but few valid reports, the problem is often process control rather than a lack of tools. A community discussion uses the literal question “What’s wrong with my workflow?”; the wording is useful because it points to diagnosable failure modes rather than a single missing scanner: the discussion can be read here.
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| Symptom | Likely cause | Correction |
|---|---|---|
| Most discoveries are unusable | Discovered and authorized assets were mixed | Add an authorization status and quarantine unconfirmed hosts |
| Requests trigger blocks or errors | Automation or rate exceeded the brief | Lower the rate, review limits and stop if performance degrades |
| Reports are marked duplicate | Prior reports or program-known issues were not checked | Search available program guidance and describe what is distinct before submitting |
| A finding cannot be reproduced | Steps, account state or timestamps were not recorded | Capture evidence during validation and use a minimal test case |
| A target becomes out of scope mid-project | The brief was not refreshed | Stop new testing, version the record and rely only on evidence gathered while authorized |
| Validation creates risk | The test attempted to prove maximum impact | Use the smallest harmless action that establishes the condition |
Historical numbers: useful context, not a success promise
Older program statistics illustrate why signal quality matters, but they are not current benchmarks for an individual researcher. In a 2017 analysis of Yelp’s first 100 days of a public bounty program, as quoted by HackerOne, 322 of 564 reports—57 percent—were categorized as duplicates or “not applicable,” and 525 of 564 were described as not actionable. The figures show how raw report volume can conceal limited security value.
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A 2017 HackerOne Pathfinder report also quoted a figure that 77 percent of programs identified a vulnerability within their first 24 hours. That report does not establish that the rate applies today, to every program, or to the expected results of a particular reconnaissance workflow. Use these historical examples to prioritize accurate scope and evidence, not to set a personal quota.
A lightweight record you can reuse
Keep one record per program and version it whenever the rules change. The following structure is intentionally small enough to maintain during real work:
Program name and official page: <record>
Scope checked: <date and time with timezone>
In-scope assets and restrictions: <asset-by-asset list>
Explicit exclusions: <hosts, paths, classes and actions>
Allowed techniques and automation limits: <rules>
Test-account process: <required pattern or supplied credentials>
Passive notes: <source, observation and timestamp>
Active notes: <authorized request, result and timestamp>
Discovered but unconfirmed assets: <pending list>
Findings: <reproduction, impact and evidence location>
Submission status: <draft, submitted, resolved or closed>
Next scope review: <date or session trigger>Keep the official wording or a precise paraphrase for unusual restrictions. The template is a practical recommendation, not a mandatory form imposed by either platform.
References for method and policy
The Web Application Hacker’s Handbook is cited as a foundational reference in an Atlassian/Bugcrowd engagement report, but its current edition and retail availability were not established here. Use books and general methodology guides for concepts, then rely on the live program brief and current platform documentation for operational decisions.
For disclosure-program design, the OWASP Cheat Sheet Series’ Vulnerability Disclosure guidance is a useful policy reference. For target-specific decisions, the controlling documents remain the program’s current scope, exclusions, testing rules and reporting instructions.
Frequently Asked Questions
How often should I recheck a bug bounty program’s scope?
Open the live brief and update history before every new work session. Create a new timestamped scope snapshot whenever targets, exclusions, testing rules or reward eligibility change.
Can I test a hostname I discovered through certificates or search results?
Not automatically. Keep it in a discovered-assets list and test it only after the current program explicitly includes it or confirms that it is an eligible, owned asset under the program’s rules.
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Immediately suspend the automated tools, record the time and observed symptoms, and review the program’s rate and automation rules before any further activity.
What makes reconnaissance evidence useful in a report?
Use an in-scope asset, reproducible steps, timestamps, the relevant account and test-data conditions, minimal request or response evidence, and a concrete explanation of security impact.
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