Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Start with a defined, authorized scope, then review the application’s exposed routes, configuration, identity and access controls, inputs, responses, and API behavior. Use a scanner as one source of evidence—not as proof that a site is vulnerable or secure. Test only systems you own or have explicit permission to assess, and use approved test accounts and data.
What an initial security check can—and cannot—tell you
A useful check is a repeatable set of tests chosen for the application, not a single scan. The OWASP Web Security Testing Guide (WSTG) covers areas including configuration, identity, authentication, authorization, sessions, input validation, error handling, cryptography, business logic, client-side testing, and APIs. Use those areas to shape coverage; not every test applies to every application.
Keep three things distinct: a checklist identifies areas to examine, a tool finding is an observation that needs context, and a confirmed vulnerability is a verified weakness with a plausible security impact. A point-in-time review can reveal exposure, but it cannot guarantee that a system is secure now or will remain secure after changes.
How to check a website or API
1. Set an authorized scope and safe test conditions
Write down the exact domains, hosts, API base paths, environments, accounts, and testing window covered by the assessment. Include production only when it is specifically authorized; use staging when available. Agree on rate limits and stop conditions, and avoid tests that could disrupt service or touch another person’s data.
Recommended Free Tools
#1 Best Overall
Use accounts and records supplied or approved for testing. If an action could change data, trigger a payment, send a message, or affect an external service, confirm that it is in scope and use a safe test path before proceeding.
2. Inventory public pages, APIs, and versions
List the public pages and account flows, relevant subdomains and API hosts, and the API descriptions available to your team, such as OpenAPI or Swagger documents. Compare those descriptions with requests made by the application and routes supported by the backend. Look for older API versions that may still be active.
Documentation is a starting point, not a complete inventory: it may be inaccurate or omit supported endpoints and parameters. The OWASP WSTG API reconnaissance guidance recommends identifying documented and undocumented API endpoints and parameters. Keep a record of what you found and which environments and versions you actually checked.
Rank #2
3. Review deployment and public configuration
Check for unnecessary HTTP methods or demo functionality, leftover test code, accessible source-control metadata, directory listings, and internal API documentation exposed to the public. Review response headers for server or technology details that do not need to be disclosed. Check that sensitive files are outside public web paths and that application and service accounts have only the privileges they need.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
These are examples of checks in OWASP’s Secure by Default guidance. A disclosed software version or header is not, by itself, proof of a vulnerability; determine whether the exposure enables a specific attack or reveals an avoidable weakness.
4. Check authentication and authorization by role
Exercise only the login, recovery, account, and role flows included in scope. Verify that each test identity can access only the records and actions its role is meant to use. For example, using approved test records, check whether changing an object identifier gives one user access to another user’s object, whether a response exposes fields beyond that user’s permissions, or whether a lower-privilege account can call a privileged function.
For APIs, assess these as separate questions: object-level authorization (which records a user can access), property-level authorization (which fields they can read or change), and function-level authorization (which actions they can invoke). Do not test against real users’ accounts or data.
5. Inspect requests, responses, inputs, and errors
Use browser developer tools or an authorized intercepting proxy to capture representative requests and responses. Compare the raw API response with what the page displays: data hidden by the interface may still be sent to the browser. Look for unnecessary personal, internal, or otherwise sensitive fields, including values that the current screen does not render.
Review how the application handles invalid input and exceptional conditions. Check whether errors expose sensitive implementation details or whether unexpected input causes unsafe behavior, staying within the agreed test conditions. The OWASP WSTG guidance on excessive data exposure describes inspecting API responses for data beyond what the client needs. Browser developer tools can help; OWASP also names Burp Suite and ZAP as examples of tools for response inspection and testing. These are examples, not a ranking or endorsement.
Rank #4
6. Check API-specific behavior
In addition to ordinary web-application checks, review the API behaviors identified in the OWASP API Security Top 10 (2023): authentication; object-, property-, and function-level authorization; resource consumption; sensitive business flows; server-side request forgery (SSRF); configuration; inventory management; and the safe handling of data from other APIs.
For example, consider whether requests are appropriately limited, whether sensitive workflows can be abused through automation, whether server-side requests can be directed to unintended destinations, and whether obsolete or undocumented API versions remain reachable. Choose tests appropriate to the service and its approved scope; the category list is a guide to areas to assess, not evidence that a particular API has any of these weaknesses.
7. Use scans as one input, then verify findings
A scanner or proxy can help identify unusual responses and candidate problems, but automated results require review. For each finding, record the request and response, test account and role, expected behavior, observed behavior, possible impact, and recommended correction. Reproduce the observation safely and determine whether it reflects a real weakness rather than expected application behavior.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Choose checks for coverage and context: a narrow automated check may not assess business logic or whether a particular user should see a particular field. The WSTG provides testing objectives and methods; a tool run against an application does not establish that all relevant weaknesses are absent.
8. Fix, retest, and keep the inventory current
Prioritize verified exposures according to their likely impact and reachability. Correct the underlying control, then rerun the relevant test to confirm the expected behavior and check that the fix has not broken an authorized workflow. Update the route, role, configuration, and dependency inventory as the application changes, and repeat checks when meaningful changes introduce new exposure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which common risks should the checklist cover?
OWASP publishes two useful awareness taxonomies with different scopes. The OWASP Top 10:2025 describes broad web-application risk areas; the API list above is specifically for APIs and is the 2023 edition. Their numbered positions are category labels, not measured prevalence or a diagnosis of your site.
Broad web-application areas: OWASP Top 10:2025
- A01 Broken Access Control
- A02 Security Misconfiguration
- A03 Software Supply Chain Failures
- A04 Cryptographic Failures
- A05 Injection
- A06 Insecure Design
- A07 Authentication Failures
- A08 Software or Data Integrity Failures
- A09 Security Logging and Alerting Failures
- A10 Mishandling of Exceptional Conditions
Use these categories to check whether your chosen tests cover the application’s relevant risks. A taxonomy is not a substitute for testing or a finding about a particular system.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteQuick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
