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To secure a web application, enforce access and business rules on the server, use safe interfaces for database queries and browser rendering, protect authentication and cookie-based requests, and include dependencies, configuration, and operations in your security work. Use the OWASP Top 10:2025 to orient your threat awareness, then turn relevant risks into testable requirements with OWASP ASVS 5.0.0.
What the OWASP Top 10:2025 tells you—and what it does not
OWASP calls its Top 10 “a standard awareness document for developers and web application security.” The 2025 edition is a useful map of major risk areas, not a complete checklist, a guarantee of security, or a comprehensive testing standard. OWASP recommends the Application Security Verification Standard (ASVS) when a team needs requirements it can verify and test.
The Top 10:2025 categories, in their published order, are:
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems- A01:2025 — Broken Access Control
- A02:2025 — Security Misconfiguration
- A03:2025 — Software Supply Chain Failures
- A04:2025 — Cryptographic Failures
- A05:2025 — Injection
- A06:2025 — Insecure Design
- A07:2025 — Authentication Failures
- A08:2025 — Software or Data Integrity Failures
- A09:2025 — Security Logging and Alerting Failures
- A10:2025 — Mishandling of Exceptional Conditions
The edition broadens supply-chain risk beyond vulnerable or outdated components to include compromises involving dependencies, build systems, and distribution infrastructure. It folds SSRF into Broken Access Control, and adds Mishandling of Exceptional Conditions, which includes improper error handling, logical errors, and fail-open behavior.
#1 Best Overall
OWASP’s 2025 contributed dataset reported that 3.73% of applications tested had one or more of the 40 CWEs in Broken Access Control, 3.00% had one or more of the 16 Security Misconfiguration CWEs, and an average of 3.80% had one or more of the 32 Cryptographic Failures CWEs. These are findings from OWASP’s contributed dataset, not universal probabilities for any particular application.
Turn awareness into requirements you can verify
Choose the reference that matches the job at hand. ASVS 5.0.0 is the latest stable version identified on OWASP’s ASVS project page; requirements can change between versions, so pin each reference to its version-qualified identifier rather than citing an unversioned requirement.
| Reference | Best used for | Practical role |
|---|---|---|
| OWASP Top 10:2025 | Awareness and prioritization | A broad risk map for team discussion and orientation; not a comprehensive test standard. |
| OWASP ASVS 5.0.0 | Requirements and verification | Testable security requirements for design, implementation, review, or assessment; identify requirements by version. |
| OWASP Cheat Sheet Series | Implementation detail | Focused guidance for particular development tasks, with mappings to ASVS and Top 10 indexes. |
For a feature, use the risk map to ask what could go wrong, select applicable requirements, and decide how each requirement will be checked. A requirement should lead to evidence—such as a test showing that one user cannot read another tenant’s record—not just a note that a control exists.
Enforce authorization and business rules at the server boundary
The browser is controlled by the user. Hidden buttons, disabled controls, client-side route guards, and identifiers sent by a client do not establish permission. For every server-side operation, check whether the authenticated principal may perform that action on that particular resource. Enforce ownership and tenant boundaries where the operation runs, including on API requests that bypass the normal interface.
Rank #3
Design the feature around abuse cases as well as intended use. Ask who could change an identifier, repeat an action, skip a step, or invoke an endpoint in an unexpected order. Treat the answers as design and test inputs rather than assuming a scanner will find business-logic flaws.
Use safe interfaces for database queries and browser rendering
Keep SQL structure separate from user values
Build database queries with parameterized interfaces so query structure is defined separately from values. Do not concatenate user-controlled input into a dynamic SQL string, and do not treat a blacklist or generic input validation as an equivalent substitute for parameterization.
Use framework escaping and avoid unsafe DOM sinks
Use your framework’s normal templating and escaping behavior correctly, including when data comes from your own API. Treat content as untrusted when it reaches the browser. Assigning untrusted data to innerHTML can create a cross-site scripting (XSS) vulnerability; use context-appropriate output handling and avoid unsafe insertion paths. Content Security Policy (CSP) can add defense in depth, but it does not replace sound prevention of XSS.
Protect authentication, sessions, and state-changing requests
Handle authentication as a lifecycle
Use well-maintained framework or library capabilities where possible. Authentication work includes safe password storage and recovery, TLS on login and authenticated pages, and re-authentication for sensitive changes. Use generic authentication errors that do not reveal whether an account exists. Follow current password guidance: OWASP recommends blocking common or previously breached passwords and warns against arbitrary periodic password changes.
Best Value
Validate CSRF defenses for cookie-authenticated applications
For applications that authenticate requests with cookies, use the framework’s CSRF protection correctly. If it does not provide suitable protection, include a token with state-changing requests and validate it on the backend. Keep safe methods such as GET free of state changes. CSRF tokens do not replace authentication or authorization, and an XSS vulnerability can defeat CSRF defenses; the controls address different risks.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep secrets and security decisions out of client code
Anything delivered to the browser can be read or modified by the user. Do not put secrets in client code or rely on client-side encryption or authorization decisions to protect an application. Enforce security-critical checks and important business rules on the server, even when the client also checks them for usability.
Include dependencies, configuration, and operations in the threat model
Application security extends beyond code written for a feature. Consider dependency and build-system risks, deployment settings, error handling, and how security-relevant events will be logged and acted on. OWASP’s program guidance recommends secure defaults, code review, threat modeling, secure-coding training, technical guardrails, and continuous testing.
The Tool Desk
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A practical workflow for a full-stack feature
- Map the trust boundaries. Identify what the browser sends, which server components handle it, what data stores it reaches, and where authentication or authorization decisions occur.
- List misuse cases. Consider unauthorized access, changed identifiers, unexpected request sequences, malicious input, and failures in dependencies or configuration.
- Set server-side controls. Specify resource-level authorization and business-rule enforcement for the relevant operations; choose parameterized queries for database access and safe rendering behavior for browser output.
- Specify identity and request protections. Review password and recovery flows, authenticated transport, sensitive-change re-authentication, error messages, and CSRF handling for cookie-authenticated state changes.
- Choose versioned requirements and evidence. Use applicable ASVS 5.0.0 requirements, recording their version-qualified identifiers. Decide what review, automated check, or test will demonstrate each control.
- Review delivery and operations. Check dependencies, secrets, deployment configuration, error handling, and logging and alerting needs as part of the feature’s security work.
- Verify both expected and hostile paths. Test allowed behavior as well as unauthorized access, altered inputs, and failure cases. Review tool findings and fix or document them rather than treating a clean scan as a security verdict.
Security is not a one-time pass through the Top 10. The useful result is a repeatable development practice: risks shape design, controls are enforced at the right boundary, and tests or reviews provide evidence that those controls work.
Quick Recap
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