Mern Sec
Security policy for MERN apps. Enforces OWASP Top 10 and CWE Top 25 mitigations.
Install
$ agentstack add skill-edfenton-claude-skills-mern-sec ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-edfenton-claude-skills-mern-sec) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Purpose
Ensure MERN code is secure by default. For security output format and core refusal policy, see /shared-sec-baseline.
MERN-specific security concerns (always check)
- NoSQL injection — reject
$-prefixed and dot-notation keys from user input - Input validation — schema validation (Zod/Joi) at every API boundary
- XSS — React escapes by default; audit
dangerouslySetInnerHTMLand raw HTML rendering - CSRF — required when using cookie-based auth; use tokens or SameSite=Strict
- Auth/authz gaps — verify authorization on every protected route handler, not just frontend
- Token storage — avoid localStorage for sensitive tokens without justification; prefer httpOnly cookies
Standard security (brief check)
- Error responses: safe envelopes, no stack traces or internal details
- Rate limiting: on auth endpoints, expensive operations, public APIs
- Dependencies: lockfile committed, no known critical vulnerabilities
Reference
For detailed OWASP/CWE mitigation patterns, see reference/mern-sec-reference.md
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: edfenton
- Source: edfenton/claude-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.