Agent skill · security · sickn33
cc-skill-security-review
This skill ensures all code follows security best practices and identifies potential vulnerabilities. Use when implementing authentication or authorization, handling user input or file uploads, or creating new API endpoints.
Why this skill is useful
Provides specific security best practices and code examples for preventing vulnerabilities that the AI wouldn't reliably generate on its own.
What it needs
About 6k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
Security Review Skill This skill ensures all code follows security best practices and identifies potential vulnerabilities. Detailed Guide Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely. When to Use Implementing authentication or authorization Handling user input or file uploads Creating new API endpoints Working with secrets or credentials Implementing payment features Storing or transmitting sensitive data Integrating third-party APIs Security Checklist 1. Secrets Management ❌ NEVER Do This ✅ ALWAYS Do This Verification Steps [ ] No hardcoded API keys, tokens, or passwords [ ] All secrets in environment variables [ ] .env.local in .gitignore [ ] No secrets in git history [ ] Production secrets in hosting platform (Vercel, Railway) 2. Input Validation Always Validate User Input File Upload Validation Verification Steps [ ] All user inputs validated with schemas [ ] File uploads restricted (size, type, extension) [ ] No direct use of user input in queries [ ] Whitelist validation (not blacklist) [ ] Error messages don't leak sensitive info 3. SQL Injection Prevention ❌ NEVER Concatenate SQL ✅ ALWAYS Use Parameterized Queries Verification Steps [ ] All database queries use parameterized queries [ ] No string concatenation in SQL [ ] ORM/query builder used correctly [ ] Supabase queries properly sanitized 4. Authentication & Authorization JWT Token Handling Authorization Checks Row Level Security (Supabase) Verification Steps [ ] Tokens stored in httpOnly cookies (not localStorage) [ ] Authorization checks before sensitive operations [ ] Row Level Security enabled in Supabase [ ] Role-based access control implemented [ ] Session management secure 5. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/cc-skill-security-review--f4e32a