# Top Web Vulnerabilities

Should be used when the user asks to "identify web application vulnerabilities"...

- Repository: https://github.com/zebbern/claude-code-guide (4691 stars)
- Category: Security
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add zebbern/claude-code-guide --skill top-web-vulnerabilities -g -a claude-code -y`
Codex: `npx skills add zebbern/claude-code-guide --skill top-web-vulnerabilities -g -a codex -y`
Cursor: `npx skills add zebbern/claude-code-guide --skill top-web-vulnerabilities -g -a cursor -y`
Gemini CLI: `npx skills add zebbern/claude-code-guide --skill top-web-vulnerabilities -g -a gemini-cli -y`

## 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.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# 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

### Phase 1: Injection Vulnerabilities Assessment

Evaluate injection attack vectors targeting data processing components:

**SQL Injection (1)**
- Definition: Malicious SQL code inserted into input fields to manipulate database queries
- Root Cause: Lack of input validation, improper use of parameterized queries
- Impact: Unauthorized data access, data manipulation, database compromise
- Mitigation: Use parameterized queries/prepared statements, input validation, least privilege database accounts

The rest: https://github.com/zebbern/claude-code-guide/blob/HEAD/skills/top-web-vulnerabilities/SKILL.md