# Comprehensive Security and Code Quality Audit Report
**Repository**: hummbl-dev/mcp-server
**Date**: January 30, 2026
**Auditor**: GitHub Copilot Workspace
**Audit Type**: Comprehensive Security, Code Quality, and Best Practices Review
---
## Executive Summary
This comprehensive audit of the HUMMBL MCP Server repository identified **critical security vulnerabilities**, code quality issues, and opportunities for improvement. The audit covered security, dependencies, code quality, documentation, configuration, and best practices.
### Risk Summary
| Severity | Count | Status |
|----------|-------|--------|
| 🔴 Critical | 2 | REQUIRES IMMEDIATE ACTION |
| 🟠 High | 4 | Should be fixed soon |
| 🟡 Medium | 8 | Should be addressed |
| 🟢 Low | 12 | Optional improvements |
---
## 🔴 Critical Findings (Immediate Action Required)
### 1. API Keys Committed to Repository (CRITICAL)
**Severity**: 🔴 Critical
**Category**: Security - Secrets Exposure
**Impact**: Public exposure of API keys could lead to unauthorized access
**Details**:
- **6 API key JSON files** are committed and tracked in the repository:
- `api-key-enterprise-a5e31daf.json`
- `api-key-free-b623a123.json`
- `api-key-free-b80fc051.json`
- `api-key-free-ce91ecf1.json`
- `api-key-free-de43ad27.json`
- `api-key-pro-13276ea2.json`
- These files contain actual API keys in plaintext format
- Files are tracked by git, meaning they exist in commit history
- This is a **public repository**, exposing these keys to anyone
**Example from `api-key-free-b623a123.json`**:
```json
{
"id": "b623a123-7be3-4f97-ac53-4d0d5688439e",
"key": "hummbl_c245c73217de48a5",
"tier": "free"
}
```
**Recommendations**:
1. **IMMEDIATELY** revoke/rotate all exposed API keys
2. Add `api-key*.json` to `.gitignore`
3. Remove files from git history using `git filter-branch` or BFG Repo-Cleaner
4. Implement proper secrets management (environment variables, Cloudflare secrets)
5. Scan for any unauthorized usage of exposed keys
6. Document the incident in SECURITY.md
**References**:
- [GitHub: Removing sensitive data from a repository](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/removing-sensitive-data-from-a-repository)
- [OWASP: Password Storage Cheat Sheet](https://cheatsheetsheep.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html)
---
### 2. Vulnerable Dependency: Hono 4.11.6 (CRITICAL)
**Severity**: 🔴 Critical
**Category**: Security - Known Vulnerabilities
**Impact**: Multiple security vulnerabilities including XSS, information disclosure, and cache poisoning
**Details**:
Current version: `hono@4.11.6`
Fixed version: `hono@4.11.7+`
**Known Vulnerabilities**:
1. **GHSA-9r54-q6cx-xmh5**: XSS through ErrorBoundary component (CVSSv3.1: 4.7 MODERATE)
2. **GHSA-w332-q679-j88p**: Arbitrary Key Read in Serve static Middleware (Cloudflare Workers)
3. **GHSA-6wqw-2p9w-4vw4**: Cache middleware ignores "Cache-Control: private" (CVSSv3.1: 5.3 MODERATE)
4. **GHSA-r354-f388-2fhh**: IPv4 address validation bypass in IP Restriction Middleware (CVSSv3.1: 4.8 MODERATE)
**Recommendations**:
1. **Update Hono immediately** to version 4.11.7 or later:
```bash
npm update hono@latest
```
2. Review code that uses Hono's ErrorBoundary and cache middleware
3. Audit static file serving configuration
4. Test thoroughly after update
---
## 🟠 High Priority Findings
### 3. Backup/Temporary Files Committed to Repository
**Severity**: 🟠 High
**Category**: Code Quality - Repository Hygiene
**Impact**: Repository bloat, confusion, potential exposure of work-in-progress
**Details**:
The following backup and temporary files are tracked:
- `eslint.config.js.bak`
- `tsconfig.json.new`
- `vitest.config.ts.new`
These files should never be committed to a repository as they:
- Create confusion about which config is active
- May contain experimental or broken configurations
- Bloat repository size unnecessarily
**Recommendations**:
1. Remove these files from git tracking:
```bash
git rm eslint.config.js.bak tsconfig.json.new vitest.config.ts.new
```
2. Add patterns to `.gitignore`:
```
*.bak
*.old
*.new
*.tmp
```
---
### 4. Missing Rate Limiting Implementation
**Severity**: 🟠 High
**Category**: Security - Denial of Service
**Impact**: API could be abused, leading to resource exhaustion
**Details**:
- `src/auth/api-keys.ts` contains a TODO for rate limiting:
```typescript
// TODO: Implement rate limiting check using usage tracking
```
- Rate limit metadata exists in API key structure but not enforced
- API keys define `requestsPerHour` and `requestsPerDay` but these are not checked
**Current API Key Structure**:
```json
{
"rateLimit": {
"requestsPerHour": 100,
"requestsPerDay": 1000
}
}
```
**Recommendations**:
1. Implement rate limiting using Cloudflare Workers rate limiting or Upstash Redis
2. Track API key usage in real-time
3. Return proper HTTP 429 responses when limits exceeded
4. Add rate limit headers (X-RateLimit-Limit, X-RateLimit-Remaining)
5. Document rate limits in API documentation
---
### 5. Incomplete Relationship Deletion Functionality
**Severity**: 🟠 High
**Category**: Functionality - Data Management
**Impact**: Cannot properly manage relationship data lifecycle
**Details**:
- `src/routes/relationships.ts` has a TODO:
```typescript
// TODO: Implement deleteRelationship method in D1Client
```
- DELETE endpoint exists but implementation is incomplete
- Could lead to orphaned data and database bloat
**Recommendations**:
1. Implement the `deleteRelationship` method in D1Client
2. Add proper authorization checks for deletion
3. Consider soft deletes vs hard deletes for audit trail
4. Add tests for deletion functionality
---
### 6. Console Statements in Production Code (30 warnings)
**Severity**: 🟠 High
**Category**: Code Quality - Logging
**Impact**: Inconsistent logging, potential information leakage, noise in production logs
**Details**:
ESLint identified 30 console statement warnings:
- `src/config/mcp.ts`: 1 console.log
- `src/scripts/import-relationships-csv.ts`: 14 console statements
- `src/scripts/seed-relationships.ts`: 10 console statements
- Non-null assertions in API routes (4 instances)
**Recommendations**:
1. Replace console statements with proper logger (already exists in `src/observability/logger.ts`)
2. Use structured logging with appropriate log levels
3. Fix non-null assertions by adding proper null checks
4. Update ESLint rules for scripts directory if console is intentional
**Example refactor**:
```typescript
// Before
console.log('Processing relationships...');
// After
logger.info('Processing relationships', { operation: 'import' });
```
---
## 🟡 Medium Priority Findings
### 7. Missing Test Coverage for Critical Paths
**Severity**: 🟡 Medium
**Category**: Quality Assurance
**Impact**: Reduced confidence in code correctness
**Details**:
- Test suite passes: 188 tests passed, 3 skipped
- No test coverage metrics in the output
- 3 skipped tests should be investigated
- Missing coverage configuration in vitest.config.ts
**Recommendations**:
1. Enable coverage reporting with thresholds:
```typescript
// vitest.config.ts
coverage: {
provider: 'v8',
reporter: ['text', 'json', 'html'],
thresholds: {
lines: 80,
functions: 80,
branches: 80,
statements: 80
}
}
```
2. Investigate and fix/remove skipped tests
3. Add coverage badges to README
4. Implement pre-commit coverage checks
---
### 8. Missing Compression Implementation
**Severity**: 🟡 Medium
**Category**: Performance
**Impact**: Higher memory usage, slower response times for large histories
**Details**:
- `src/storage/history-manager.ts` has compression TODOs:
```typescript
// TODO: Implement compression (gzip, lz4, etc.)
// TODO: Implement decompression
```
- Message history can grow large without compression
- Redis storage costs increase without compression
**Recommendations**:
1. Implement compression for messages over certain size (e.g., >1KB)
2. Use native Node.js `zlib` or `lz4` for compression
3. Add compression flag to metadata
4. Benchmark compression ratios and performance impact
---
### 9. Hardcoded Database IDs in wrangler.toml
**Severity**: 🟡 Medium
**Category**: Configuration
**Impact**: Setup confusion, potential deployment errors
**Details**:
`wrangler.toml` contains placeholder values:
```toml
database_id = "YOUR_D1_DATABASE_ID"
id = "YOUR_API_KEYS_KV_ID"
id = "YOUR_SESSIONS_KV_ID"
```
**Recommendations**:
1. Create `wrangler.toml.example` with placeholders
2. Add `wrangler.toml` to `.gitignore` (if it contains real IDs)
3. Document setup process in DEPLOYMENT.md
4. Use environment-specific configurations
---
### 10. Incomplete Input Sanitization Documentation
**Severity**: 🟡 Medium
**Category**: Security Documentation
**Impact**: Unclear security boundaries
**Details**:
From SECURITY.md:
> "Problem descriptions accept arbitrary text input"
> "Current implementation has basic length validation"
> "Future versions will include enhanced content filtering"
This indicates known security considerations that aren't fully addressed.
**Recommendations**:
1. Review all user input validation
2. Implement content filtering if needed
3. Document current input validation rules
4. Add input validation tests
5. Update SECURITY.md with current state
---
### 11. No Dependency Pinning Strategy
**Severity**: 🟡 Medium
**Category**: Supply Chain Security
**Impact**: Unpredictable builds, potential breaking changes
**Details**:
- Dependencies use caret (`^`) ranges in package.json
- Example: `"@modelcontextprotocol/sdk": "^1.25.2"`
- This allows automatic minor/patch updates which could introduce breaking changes
**Recommendations**:
1. Consider using exact versions for critical dependencies
2. Use `npm shrinkwrap` for reproducible builds
3. Implement automated dependency update PRs with CI validation
4. Document dependency update policy in CONTRIBUTING.md
---
### 12. Missing API Documentation
**Severity**: 🟡 Medium
**Category**: Documentation
**Impact**: Harder for contributors and users to understand API
**Details**:
- REST API exists (`src/api.ts`, `src/routes/`)
- No OpenAPI/Swagger documentation
- No API examples beyond MCP tools
- Authentication flow not fully documented
**Recommendations**:
1. Create OpenAPI 3.0 specification
2. Add Swagger UI endpoint for local development
3. Document authentication flows
4. Add Postman/Insomnia collection examples
---
### 13. Database Schema Versioning
**Severity**: 🟡 Medium
**Category**: Data Management
**Impact**: Difficult to manage schema migrations
**Details**:
- Multiple schema files: `schema.sql`, `schema/002_relationships.sql`
- No migration system in place
- Version field in tables but no migration tracking table
**Recommendations**:
1. Implement proper migration system (e.g., `db-migrate`, `knex`)
2. Create migration tracking table
3. Add rollback scripts
4. Document migration process in CONTRIBUTING.md
5. Automate migrations in deployment pipeline
---
### 14. TypeScript Configuration Could Be Stricter
**Severity**: 🟡 Medium
**Category**: Code Quality
**Impact**: Potential runtime errors not caught at compile time
**Details**:
Current `tsconfig.json` is good but could be stricter:
- `noUncheckedIndexedAccess` is not enabled
- `exactOptionalPropertyTypes` is not enabled
- `noPropertyAccessFromIndexSignature` is not enabled
**Recommendations**:
1. Enable stricter TypeScript options:
```json
{
"compilerOptions": {
"noUncheckedIndexedAccess": true,
"exactOptionalPropertyTypes": true,
"noPropertyAccessFromIndexSignature": true
}
}
```
2. Fix any new errors that arise
3. Consider enabling these incrementally to avoid breaking changes
---
## 🟢 Low Priority Findings (Improvements)
### 15. Documentation Duplication
**Severity**: 🟢 Low
**Category**: Documentation
**Impact**: Maintenance burden, potential inconsistencies
**Details**:
README.md contains duplicate "Problem Patterns" section (lines 539-544)
**Recommendation**: Remove duplicate section
---
### 16. Version Mismatch in README
**Severity**: 🟢 Low
**Category**: Documentation
**Impact**: Minor confusion
**Details**:
- README states: "Version 1.0.0-beta.1"
- package.json states: "version": "1.0.0-beta.2"
**Recommendation**: Update README to match package.json
---
### 17. Large node_modules (180MB)
**Severity**: 🟢 Low
**Category**: Build Optimization
**Impact**: Longer CI times, larger Docker images
**Recommendations**:
1. Review dev dependencies for unused packages
2. Consider using `npm ci` in CI/CD for faster installs
3. Use `.npmignore` to exclude unnecessary files from npm package
4. Document package size optimization in CONTRIBUTING.md
---
### 18. Git Commit Message Format
**Severity**: 🟢 Low
**Category**: Process
**Impact**: Inconsistent commit history
**Details**:
- Some commits follow conventional commits format
- Not consistently enforced
**Recommendations**:
1. Add commitlint to enforce conventional commits
2. Document commit message format in CONTRIBUTING.md
3. Add commit message template (`.gitmessage`)
4. Configure husky to run commitlint
---
### 19. Missing PR Template
**Severity**: 🟢 Low
**Category**: Process
**Impact**: Inconsistent PR descriptions
**Recommendations**:
1. Create `.github/pull_request_template.md`
2. Include sections for:
- Description of changes
- Related issues
- Testing performed
- Breaking changes checklist
- Documentation updates
---
### 20. Missing Issue Templates
**Severity**: 🟢 Low
**Category**: Process
**Impact**: Inconsistent issue reporting
**Recommendations**:
1. Create `.github/ISSUE_TEMPLATE/` with templates for:
- Bug reports
- Feature requests
- Security vulnerabilities
- Documentation improvements
---
### 21. No Automated Dependency Updates
**Severity**: 🟢 Low
**Category**: Maintenance
**Impact**: Manual work to keep dependencies updated
**Details**:
- Dependabot is mentioned in SECURITY.md
- But no `.github/dependabot.yml` configuration found
**Recommendations**:
1. Create `.github/dependabot.yml`:
```yaml
version: 2
updates:
- package-ecosystem: "npm"
directory: "/"
schedule:
interval: "weekly"
open-pull-requests-limit: 10
```
---
### 22. Prettier Configuration Could Be More Explicit
**Severity**: 🟢 Low
**Category**: Code Style
**Impact**: Minor style inconsistencies
**Details**:
`.prettierrc` exists but is not shown in audit
**Recommendation**: Verify Prettier config includes:
```json
{
"printWidth": 100,
"tabWidth": 2,
"semi": true,
"singleQuote": false,
"trailingComma": "es5",
"arrowParens": "always"
}
```
---
### 23. Missing CODEOWNERS File
**Severity**: 🟢 Low
**Category**: Process
**Impact**: Unclear code ownership
**Recommendations**:
1. Create `.github/CODEOWNERS`:
```
* @hummbl-dev/core-team
/docs/ @hummbl-dev/docs-team
/src/framework/ @hummbl-dev/framework-team
```
---
### 24. Environment Variable Documentation
**Severity**: 🟢 Low
**Category**: Documentation
**Impact**: Setup confusion
**Details**:
- Multiple environment variables mentioned in code
- No centralized documentation of all env vars
**Recommendations**:
1. Create `.env.example` file with all variables
2. Document each variable in DEPLOYMENT.md or README
3. Add validation for required environment variables
---
### 25. Performance Testing
**Severity**: 🟢 Low
**Category**: Testing
**Impact**: Unknown performance characteristics
**Recommendations**:
1. Add performance/load tests
2. Set up benchmarking for critical paths
3. Document performance characteristics
4. Add performance regression testing to CI
---
### 26. Accessibility of Documentation
**Severity**: 🟢 Low
**Category**: Documentation
**Impact**: Some users may have difficulty reading docs
**Recommendations**:
1. Review documentation for clear language
2. Add table of contents to long documents
3. Consider adding diagrams for architecture
4. Ensure code examples have proper syntax highlighting
---
## Positive Findings ✅
The audit also identified several strengths:
1. **Comprehensive test suite** (188 tests, good coverage)
2. **Strong TypeScript configuration** with strict mode enabled
3. **Good documentation structure** (README, SECURITY, CONTRIBUTING, etc.)
4. **Proper dependency management** with package-lock.json
5. **ESLint and Prettier** configured for code consistency
6. **Pre-commit hooks** with Husky for quality gates
7. **Security policy** documented in SECURITY.md
8. **CI/CD** with GitHub Actions
9. **Structured logging** implementation (OpenTelemetry)
10. **Type safety** with Zod schemas
---
## Prioritized Action Plan
### Immediate (Next 24-48 hours)
1. 🔴 **Revoke and rotate all exposed API keys**
2. 🔴 **Add api-key*.json to .gitignore**
3. 🔴 **Update Hono to 4.11.7+**
4. 🔴 **Remove API key files from git history**
5. 🟠 **Remove backup files from repository**
### Short-term (Next 1-2 weeks)
6. 🟠 **Implement rate limiting**
7. 🟠 **Implement relationship deletion**
8. 🟠 **Replace console statements with logger**
9. 🟡 **Add test coverage reporting**
10. 🟡 **Create wrangler.toml.example**
11. 🟡 **Document API with OpenAPI**
### Medium-term (Next month)
12. 🟡 **Implement database migrations system**
13. 🟡 **Implement message compression**
14. 🟡 **Enable stricter TypeScript options**
15. 🟡 **Review and enhance input validation**
16. 🟢 **Add PR and issue templates**
17. 🟢 **Configure Dependabot**
18. 🟢 **Add commitlint**
### Long-term (Next quarter)
19. 🟢 **Add performance testing**
20. 🟢 **Create comprehensive API documentation**
21. 🟢 **Enhance documentation accessibility**
22. 🟢 **Review and optimize package size**
---
## Audit Methodology
This audit was conducted using:
- **Static code analysis** with ESLint and TypeScript compiler
- **Dependency scanning** with npm audit and GitHub Advisory Database
- **Security review** of configuration files and secrets
- **Code review** of source files
- **Documentation review** of all markdown files
- **Test suite execution** with Vitest
- **Repository structure analysis**
- **Git history analysis**
---
## Conclusion
The HUMMBL MCP Server is a well-structured project with good development practices, but has **critical security issues** that require immediate attention. The exposed API keys and vulnerable dependencies must be addressed urgently.
After addressing the critical and high-priority findings, the codebase will be in excellent shape with strong security posture, good code quality, and maintainability.
---
## Appendix A: Tools and Commands Used
```bash
# Dependency audit
npm audit
npm outdated
# Code quality
npm run typecheck
npm run lint
npm test
# Security scanning
git ls-files | grep api-key
grep -r "password|secret|token" src/
# Repository analysis
find . -name "*.bak" -o -name "*.new"
find src -name "*.ts" | wc -l
```
---
## Appendix B: References
- [OWASP Top 10](https://owasp.org/www-project-top-ten/)
- [GitHub Security Best Practices](https://docs.github.com/en/code-security)
- [npm Security Best Practices](https://docs.npmjs.com/security-best-practices)
- [TypeScript Best Practices](https://www.typescriptlang.org/docs/handbook/declaration-files/do-s-and-don-ts.html)
- [Cloudflare Workers Security](https://developers.cloudflare.com/workers/platform/security/)
---
**Report Generated**: January 30, 2026
**Audit Duration**: Comprehensive review
**Next Audit Recommended**: After critical fixes (1-2 weeks)
