OWASP Web Security Lab

Interactive hands-on labs covering the OWASP Top 10 2025. Learn web application security through real-world attack simulations and defense strategies.

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🎉 All Labs Complete!

10 of 10 interactive labs now live. Explore attack simulations, code examples, and defense strategies for every OWASP Top 10 category.

OWASP Top 10 : 2025

A01:2025

Broken Access Control

LIVE

Restrictions on authenticated users are not properly enforced. Attackers can exploit flaws to access unauthorized functionality and data.

94% of apps tested
A02:2025

Security Misconfiguration

LIVE

Missing security hardening, default credentials, open cloud storage, verbose errors, and unnecessary features enabled.

Moved up from #5
A03:2025

Software Supply Chain Failures

LIVE

Compromised dependencies, tampered build systems, malicious packages. NEW category expanding on vulnerable components.

NEW in 2025
A04:2025

Cryptographic Failures

LIVE

Failures related to cryptography which often lead to sensitive data exposure. Weak ciphers, hardcoded keys, poor TLS.

Formerly Sensitive Data Exposure
A05:2025

Injection

LIVE

SQL, NoSQL, OS, LDAP injection. User-supplied data is not validated, filtered, or sanitized by the application.

Dropped from #3
A06:2025

Insecure Design

LIVE

Missing or ineffective security controls. Flaws in design and architecture that cannot be fixed by implementation.

Design-level flaws
A07:2025

Authentication Failures

LIVE

Broken authentication mechanisms allowing attackers to compromise passwords, keys, session tokens, or user identities.

Identity compromise
A08:2025

Software & Data Integrity Failures

LIVE

Code and infrastructure that does not protect against integrity violations. CI/CD pipelines, auto-updates, deserialization.

Trust boundary failures
A09:2025

Logging & Alerting Failures

LIVE

Insufficient logging, detection, monitoring, and active response. Attacks go undetected without proper observability.

Detection gaps
A10:2025

Mishandling of Exceptional Conditions

LIVE

Improper error handling, logical errors, and issues from abnormal conditions. NEW category for edge case failures.

NEW in 2025

Interactive Simulations

Hands-on attack and defense simulations for each OWASP vulnerability type.

Vulnerable vs Secure Code

Side-by-side code comparisons showing vulnerable patterns and secure fixes.

Defense Strategies

OWASP-recommended mitigations, checklists, and security best practices.

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