A03: Injection<\/strong><\/h3>\n\n\n\nSQL injection is the classic example, but injection covers any case where untrusted user input is interpreted as code or commands SQL, LDAP, OS commands, XML. If you are building a query by concatenating strings with user input, you are vulnerable.<\/p>\n\n\n\n# VULNERABLE — never do thisParameterised queries and ORMs with proper usage (not raw query construction) eliminate SQL injection. Input validation and allowlists handle the rest.<\/p>\n\n\n\n
A04: Insecure Design<\/strong><\/h3>\n\n\n\nThis is the only category that cannot be fixed with a patch it means the security problem is in how the feature was designed, not just how it was implemented. Missing rate limiting on a login endpoint, no account lockout after failed attempts, or no email verification on account creation are design failures. Fix: threat-model during design, not after.<\/p>\n\n\n\n
A05: Security Misconfiguration<\/strong><\/h3>\n\n\n\nDefault credentials left unchanged, directory listing enabled, verbose error messages showing stack traces in production, unnecessary ports open, cloud storage buckets set to public misconfiguration is one of the most prevalent risks precisely because it is invisible unless you go looking. <\/p>\n\n\n\n
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\ud83d\udca1 Did You Know?<\/strong>\n Equifax data breach of 2017<\/strong>, which exposed the personal information of approximately 147 million people<\/strong>, was traced to an unpatched vulnerability in Apache Struts<\/strong>. Incidents like this are a major reason why OWASP A06: Vulnerable and Outdated Components<\/strong> remains one of the most critical security risks in modern applications. Even a single outdated library or framework can create an entry point for attackers, making regular patching, dependency monitoring, and software updates essential cybersecurity practices.\n\n<\/div>\n\n\n\nA06: Vulnerable and Outdated Components<\/strong><\/h3>\n\n\n\nEvery dependency you install has its own dependencies, and any of them can carry known vulnerabilities. Running npm audit, pip-audit, or Snyk as part of your CI\/CD pipeline catches known vulnerable packages before they reach production. Fix: keep dependencies updated, subscribe to security advisories for your core dependencies, and drop packages you no longer use <\/p>\n\n\n\n
A07: Identification and Authentication Failures<\/strong><\/h3>\n\n\n\nWeak password policies, no multi-factor authentication, session tokens that do not expire, allowing credential stuffing without rate limiting, or storing sessions in insecure cookies. Fix: use a proven auth library rather than rolling your own, implement MFA, enforce session timeouts, and rate-limit authentication endpoints.<\/p>\n\n\n\n
A08: Software and Data Integrity Failures<\/strong><\/h3>\n\n\n\nThis covers two things: deserialising untrusted data without validation (which can lead to remote code execution), and using build or update pipelines that do not verify the integrity of the code being deployed. The SolarWinds supply chain attack is the extreme example. <\/p>\n\n\n\n
Fix: verify signatures on dependencies, use Subresource Integrity for CDN-loaded scripts, and never deserialise data from untrusted sources without a schema check.<\/p>\n\n\n\n
A09: Security Logging and Monitoring Failures<\/strong><\/h3>\n\n\n\nIf your application is being attacked right now, would you know? Most teams would not \u2014 because they are not logging authentication failures, privilege escalations, or input validation errors in a way that anyone monitors. Security incidents discovered internally are caught on average 200 days after they start. <\/p>\n\n\n\n
Fix: log every authentication event, failed access control check, and input validation error, and alert on anomalies.<\/p>\n\n\n\n
A10: Server-Side Request Forgery (SSRF)<\/strong><\/h3>\n\n\n\nWhen your server fetches a URL based on user-supplied input, an attacker can point that URL at internal services your cloud metadata endpoint, internal databases, or admin interfaces that are not exposed externally. SSRF attacks against AWS metadata endpoints have been behind several high-profile breaches. <\/p>\n\n\n\n
OWASP Top 10: Quick Reference<\/strong><\/h2>\n\n\n\n#<\/strong><\/td>Risk<\/strong><\/td>One-Line Fix<\/strong><\/td><\/tr>A01<\/strong><\/td>Broken Access Control<\/td> Enforce permissions server-side on every request<\/td><\/tr> A02<\/strong><\/td>Cryptographic Failures<\/td> Encrypt sensitive data at rest and in transit; use bcrypt\/Argon2<\/td><\/tr> A03<\/strong><\/td>Injection<\/td> Use parameterised queries; never concatenate user input into commands<\/td><\/tr> A04<\/strong><\/td>Insecure Design<\/td> Threat-model during design, not after; build in rate limiting and lockouts<\/td><\/tr> A05<\/strong><\/td>Security Misconfiguration<\/td> Disable defaults; hide stack traces; audit configs automatically<\/td><\/tr> A06<\/strong><\/td>Vulnerable and Outdated Components<\/td> Run dependency audits in CI; keep packages updated; remove unused deps<\/td><\/tr> A07<\/strong><\/td>Auth and Identification Failures<\/td> Use proven auth libraries; add MFA; enforce session expiry<\/td><\/tr> A08<\/strong><\/td>Software and Data Integrity Failures<\/td> Verify signatures; use SRI for CDN scripts; validate deserialised data<\/td><\/tr> A09<\/strong><\/td>Security Logging and Monitoring Failures<\/td> Log auth and access events; alert on anomalies; monitor actively<\/td><\/tr> A10<\/strong><\/td>Server-Side Request Forgery<\/td> Allowlist URLs your server fetches; block private IP ranges<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\nCommon Mistakes Developers Make with Security<\/strong><\/h2>\n\n\n\n1. Treating security as a post-launch task: <\/strong>Security findings found in design cost almost nothing to fix. The same finding found after launch, especially after a breach, can cost orders of magnitude more in remediation, regulatory fines, and reputational damage. Make security part of the definition of done, not a separate phase.<\/p>\n\n\n\n2. Rolling your own authentication: <\/strong>Authentication is one of the hardest things to implement correctly. Session management, password hashing, token expiry, and brute-force protection all have subtle failure modes. Use a battle-tested library or service Auth0, Firebase Auth, Django’s built-in auth and reserve your engineering time for business logic.<\/p>\n\n\n\n3. Trusting client-side validation alone: <\/strong>Every input validation check in your frontend required fields, email formats, max lengths can be bypassed by anyone who opens the browser console or sends a raw HTTP request. Always validate server-side. Client-side validation is a UX feature, not a security control. <\/p>\n\n\n\nConclusion<\/strong><\/h2>\n\n\n\nThe OWASP Top 10 highlights the most common web application security risks, including broken access control, injection, cryptographic failures, and misconfiguration. These vulnerabilities often arise from insecure coding practices, making secure development essential for building reliable and trustworthy applications. <\/p>\n\n\n\n
FAQ<\/strong><\/h2>\n\n\n\n
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1. \u00a0 \u00a0 What is the OWASP Top 10?<\/strong><\/h3>\n\n\n
The OWASP Top 10 is a list of the ten most critical web application security risks, maintained by the Open Worldwide Application Security Project. It is compiled from real-world vulnerability data across thousands of organisations and updated periodically to reflect the current threat landscape.<\/p>\n\n<\/div>\n<\/div>\n
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2. \u00a0 \u00a0 Why should developers know the OWASP Top 10?<\/strong><\/h3>\n\n\n
Most web application breaches are caused by vulnerabilities that appear on the OWASP Top 10 not sophisticated zero-day exploits. Understanding these risks helps developers avoid common coding mistakes that lead to data breaches, and it is also referenced by compliance frameworks like PCI-DSS, SOC 2, and HIPAA.<\/p>\n\n<\/div>\n<\/div>\n
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3. \u00a0 \u00a0 What is the most common OWASP vulnerability?<\/strong><\/h3>\n\n\n
Broken Access Control (A01) has ranked as the most common risk in the latest OWASP Top 10, appearing in over 94% of tested applications. It occurs when users can access resources or perform actions they should not be authorised for, typically because permissions are only checked in the frontend or inconsistently enforced.<\/p>\n\n<\/div>\n<\/div>\n
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4. \u00a0 \u00a0 What is SQL injection and how do you prevent it?<\/strong><\/h3>\n\n\n
SQL injection is a type of injection attack where user-supplied input is inserted directly into a database query, allowing attackers to manipulate the query. Prevent it by using parameterised queries or prepared statements rather than building queries through string concatenation with user input.<\/p>\n\n<\/div>\n<\/div>\n
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5. \u00a0 \u00a0 How often is the OWASP Top 10 updated?<\/strong><\/h3>\n\n\n
OWASP updates the Top 10 periodically, approximately every three to four years based on new vulnerability data collected from participating organisations. The current version is the 2021 edition. Major updates reflect shifts in how applications are built and how attackers are targeting them.<\/p>\n\n<\/div>\n<\/div>\n
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6. \u00a0 \u00a0 What is SSRF in the OWASP Top 10?<\/strong><\/h3>\n\n\n
Server-Side Request Forgery (A10) is a vulnerability where an attacker tricks the server into making HTTP requests to unintended destinations, often internal services, cloud metadata endpoints, or admin interfaces not exposed publicly.<\/p>\n\n<\/div>\n<\/div>\n
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7. What is the difference between authentication and access control vulnerabilities? <\/strong><\/h3>\n\n\n
Authentication (A07) failures are about correctly verifying who a user is: weak passwords, missing MFA, insecure session management. Access control (A01) failures are about correctly limiting what an authenticated user is allowed to do, checking permissions on every endpoint, and validating resource ownership.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"
Security gets treated as someone else’s problem right up until the breach. Most data leaks and application compromises are not caused by sophisticated zero-day exploits; they are caused by the same ten categories of mistakes that have appeared on the OWASP Top 10 for years. OWASP, the Open Worldwide Application Security Project, maintains this list […]<\/p>\n","protected":false},"author":63,"featured_media":119818,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[621],"tags":[],"views":"37","authorinfo":{"name":"Vishalini Devarajan","url":"https:\/\/www.guvi.in\/blog\/author\/vishalini\/"},"thumbnailURL":"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2026\/06\/owasp-top-10-explained-300x118.webp","_links":{"self":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/118329"}],"collection":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/users\/63"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/comments?post=118329"}],"version-history":[{"count":3,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/118329\/revisions"}],"predecessor-version":[{"id":119817,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/118329\/revisions\/119817"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media\/119818"}],"wp:attachment":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media?parent=118329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/categories?post=118329"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/tags?post=118329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}