OWASP Top 10 2025: What Changed and Why It Matters
The OWASP Top 10 is a community-maintained shortlist of the 10 most critical web application security risks. It gets updated every 3-4 years as threats evolve. The 2025 release reflects the reality of modern applications: cloud infrastructure, supply-chain dependencies, and emerging attack vectors.
The Top 10 in 2025
| Rank | Vulnerability | What It Is | 2021 vs 2025 |
|---|---|---|---|
| 1 | Broken Access Control | Users access resources they shouldn't. IDOR is the classic example. | Moved up from #5 |
| 2 | Cryptographic Failures | Encryption is weak, missing, or broken. Previously "Sensitive Data Exposure". | Renamed |
| 3 | Injection | SQL, OS commands, LDAP—untrusted input reaches code interpreters. | Stable |
| 4 | Insecure Design | Security was never part of the design; the architecture is fundamentally flawed. | NEW |
| 5 | Security Misconfiguration | Default credentials, unnecessary services, outdated frameworks exposed. | Stable |
| 6 | Vulnerable and Outdated Components | Using libraries with known exploits. | Stable |
| 7 | Authentication Failures | Weak passwords, credential stuffing, broken session management. | Stable |
| 8 | Software and Data Integrity Failures | Compromised dependencies, malicious updates, unsigned deployments. | NEW |
| 9 | Logging and Monitoring Failures | No alerts on attacks; no trail for investigation. | Stable |
| 10 | Server-Side Request Forgery (SSRF) | App is tricked into making requests to internal services. | NEW |
Three New Entries in 2025
Insecure Design (Rank #4)
Why it entered: OWASP split design-level flaws from implementation bugs.
What it means: A perfectly coded app with bad architecture is still insecure. You can't patch your way out of it—you have to redesign.
Example: An app that sends all data unencrypted because encryption was never considered in the design.
Software and Data Integrity Failures (Rank #8)
Why it entered: Supply-chain attacks have become mainstream.
What it means: You depend on third-party libraries. If one is compromised, your entire app is compromised.
Example: Malicious code injected into a popular npm package. Every app using it is now infected.
Server-Side Request Forgery / SSRF (Rank #10)
Why it entered: Cloud adoption created a new attack surface.
What it means: Modern apps have internal services and cloud metadata endpoints that should never be reachable from the internet. SSRF tricks the app into accessing them.
Example: An app downloads images from user-provided URLs. An attacker sends http://169.254.169.254/ (AWS metadata endpoint), and the app fetches AWS credentials.
What Changed from 2021?
- Up: Broken Access Control moved from #5 to #1—it's now the #1 risk.
- Renamed: Sensitive Data Exposure → Cryptographic Failures (more precise).
- New: Three categories entered: Insecure Design, Software/Data Integrity Failures, SSRF.
- Dropped: Cross-Site Scripting (XSS) and Deserialization fell out of top 10 (still serious, but lower priority statistically).
How This Course Maps to OWASP 2025
| OWASP 2025 Risk | Where It's Taught |
|---|---|
| Broken Access Control | IDOR lesson ✓ |
| Cryptographic Failures | TLS lesson (Phase 1) ✓ |
| Injection | SQL Injection + Command Injection ✓ |
| Insecure Design | Architecture lessons (framework-dependent) |
| Security Misconfiguration | Linux hardening (Phase 2) ✓ |
| Vulnerable & Outdated Components | Lab context ✓ |
| Authentication Failures | Session management ✓ |
| Software & Data Integrity | CSRF lesson ✓ |
| Logging & Monitoring | Web server logs (lab context) |
| SSRF | Coming soon |
The Real Takeaway
The 2025 list reflects a shift in how the world builds apps:
- Cloud is standard. Internal services are now attack targets (SSRF).
- Supply chain is the perimeter. Dependencies are your responsibility (Integrity Failures).
- Design matters more than code. Bad architecture can't be fixed with patches.
- Encryption is non-negotiable. It moved up the priority list.
Use the OWASP Top 10 2025 as your testing checklist. Work through the list in order, and you'll find the majority of real vulnerabilities in any app.