Web › Module 5 › Lesson 1
OWASP Top 10 Map
Map OWASP Top 10:2021 categories A01–A10 to practical defenses you can apply this week
Visual · web_developer
The OWASP Top 10 is a prioritization list—not a checklist tattoo. Each category ties to concrete controls in design, code, and operations.
Opening
Ten names, one security program
You have met injection, XSS, auth flaws, SSRF, and misconfigurations in earlier modules. The OWASP Top 10 groups the most critical web risks so teams align on what to fix first. This lesson is your defense map: category → what breaks → what to do about it.
1. A01–A05: Access, Crypto, and Design
A01 Broken Access Control
IDOR, forced browsing → enforce authorization on every object; deny by default.
A02 Cryptographic Failures
Weak TLS, exposed secrets → TLS everywhere, vault secrets, modern algorithms.
A03 Injection
SQLi, command injection → parameterized queries, input validation, least privilege DB accounts.
A04 Insecure Design
Missing threat modeling → abuse cases, rate limits, secure defaults in design reviews.
A05 Security Misconfiguration
Defaults, open buckets → hardening guides, automated config scanning, remove unused features.
2. A06–A10: Components, Auth, Integrity, Logging
A06 Vulnerable Components
Outdated libraries → SBOM, dependabot, patch SLAs.
A07 Identification & Authentication Failures
Weak login, JWT issues → MFA, session rotation, strong password storage.
A08 Software & Data Integrity Failures
Unsafe CI/CD, unsigned updates → signed artifacts, integrity checks on plugins.
A09 Security Logging & Monitoring Failures
No alerts on abuse → central logs, detect brute force and admin changes.
A10 SSRF
Server fetches attacker URLs → allowlists, block metadata and private IPs.
3. Quick Reference Table
Defense snapshot (memorize the pattern, not the acronym soup)A01 Access → authorize every request + object A02 Crypto → TLS + protect secrets at rest A03 Inject → bind parameters, never concat SQL A04 Design → threat model before you ship A05 Misconfig→ automate baselines, kill defaults A06 Components→ patch dependencies weekly A07 Auth → MFA + sessions + rate limits A08 Integrity→ sign builds, verify downloads A09 Logging → alert on auth anomalies A10 SSRF → restrict outbound fetches
A01 Access → authorize every request + object A02 Crypto → TLS + protect secrets at rest A03 Inject → bind parameters, never concat SQL A04 Design → threat model before you ship A05 Misconfig→ automate baselines, kill defaults A06 Components→ patch dependencies weekly A07 Auth → MFA + sessions + rate limits A08 Integrity→ sign builds, verify downloads A09 Logging → alert on auth anomalies A10 SSRF → restrict outbound fetches
Pick three this sprint
Teams drown if they chase all ten at once. From your app’s threat model, choose the top three categories with real exposure and measurable fixes.
Knowledge Check
OWASP A01 Broken Access Control maps to defenses like:
Multiple choice
Knowledge Check
True or False: A06 Vulnerable Components emphasizes keeping dependencies patched.
True or False
Knowledge Check
SSRF appears in the Top 10 as:
Multiple choice