Top 100 Web Vulnerabilities Reference

---
name: top-100-web-vulnerabilities-reference-48418eadde67
description: This skill should be used when the user asks to "identify web application vulnerabilities", "explain common security flaws", "understand vulnerability categories", "learn about injection attacks", "review access control weaknesses", "analyze API security issues", "assess security misconfigurations", "understand client-side vulnerabilities", "examine mobile and IoT security flaws", or "reference the OWASP-aligned vulnerability taxonomy". Use this skill to provide comprehensive vulnerability definitions, root causes, impacts, and mitigation strategies across all major web security categories.
metadata:
  author: zebbern
  version: 4.1.0-fractal
---

# Top 100 Web Vulnerabilities Reference

## Purpose

Provide a comprehensive, structured reference for the 100 most critical web application vulnerabilities organized by category. This skill enables systematic vulnerability identification, impact assessment, and remediation guidance across the full spectrum of web security threats. Content organized into 15 major vulnerability categories aligned with industry standards and real-world attack patterns.

## Prerequisites

- Basic understanding of web application architecture (client-server model, HTTP protocol)
- Familiarity with common web technologies (HTML, JavaScript, SQL, XML, APIs)
- Understanding of authentication and authorization concepts
- Access to web application security testing tools (Burp Suite, OWASP ZAP)
- Knowledge of secure coding principles recommended

## Outputs and Deliverables

- Complete vulnerability catalog with definitions, root causes, impacts, and mitigations
- Category-based vulnerability groupings for systematic assessment
- Quick reference for security testing and remediation
- Foundation for vulnerability assessment checklists and security policies

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## Core Workflow

## 🧠 Knowledge Modules (Fractal Skills)

### 1. [Phase 1: Injection Vulnerabilities Assessment](./sub-skills/phase-1-injection-vulnerabilities-assessment.md)
### 2. [Phase 2: Authentication and Session Security](./sub-skills/phase-2-authentication-and-session-security.md)
### 3. [Phase 3: Sensitive Data Exposure](./sub-skills/phase-3-sensitive-data-exposure.md)
### 4. [Phase 4: Security Misconfiguration](./sub-skills/phase-4-security-misconfiguration.md)
### 5. [Phase 5: XML-Related Vulnerabilities](./sub-skills/phase-5-xml-related-vulnerabilities.md)
### 6. [Phase 6: Broken Access Control](./sub-skills/phase-6-broken-access-control.md)
### 7. [Phase 7: Insecure Deserialization](./sub-skills/phase-7-insecure-deserialization.md)
### 8. [Phase 8: API Security Assessment](./sub-skills/phase-8-api-security-assessment.md)
### 9. [Phase 9: Communication Security](./sub-skills/phase-9-communication-security.md)
### 10. [Phase 10: Client-Side Vulnerabilities](./sub-skills/phase-10-client-side-vulnerabilities.md)
### 11. [Phase 11: Denial of Service Assessment](./sub-skills/phase-11-denial-of-service-assessment.md)
### 12. [Phase 12: Server-Side Request Forgery](./sub-skills/phase-12-server-side-request-forgery.md)
### 13. [Phase 13: Additional Web Vulnerabilities](./sub-skills/phase-13-additional-web-vulnerabilities.md)
### 14. [Phase 14: Mobile and IoT Security](./sub-skills/phase-14-mobile-and-iot-security.md)
### 15. [Phase 15: Advanced and Zero-Day Threats](./sub-skills/phase-15-advanced-and-zero-day-threats.md)
### 16. [Vulnerability Categories Summary](./sub-skills/vulnerability-categories-summary.md)
### 17. [Critical Security Headers](./sub-skills/critical-security-headers.md)
### 18. [OWASP Top 10 Mapping](./sub-skills/owasp-top-10-mapping.md)
### 19. [Common Assessment Challenges](./sub-skills/common-assessment-challenges.md)
### 20. [Vulnerability Verification Techniques](./sub-skills/vulnerability-verification-techniques.md)