OWASP Security Cheat Sheet
OWASP Top 10 vulnerabilities, prevention strategies, and secure coding practices.
2 PagesIntermediateApr 20, 2026
OWASP Top 10 (2021)
The most critical web application security risks.
- A01- Broken Access Control
- A02- Cryptographic Failures
- A03- Injection (SQL, NoSQL, OS command)
- A04- Insecure Design
- A05- Security Misconfiguration
- A06- Vulnerable and Outdated Components
- A07- Identification and Authentication Failures
- A08- Software and Data Integrity Failures
- A09- Security Logging and Monitoring Failures
- A10- Server-Side Request Forgery (SSRF)
Preventing Injection
Use parameterized queries, never string concatenation.
sql
-- Vulnerable"SELECT * FROM users WHERE email = '" + email + "'"-- Safe: parameterized querySELECT * FROM users WHERE email = ?;
Security Headers
HTTP headers that reduce common attack surface.
text
Content-Security-Policy: default-src 'self'X-Content-Type-Options: nosniffX-Frame-Options: DENYStrict-Transport-Security: max-age=63072000
Pro Tip
Validate and sanitize input at the boundary, but rely primarily on parameterized queries/ORMs and output encoding — never trust client-side validation alone.
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