slopsec

slopsec

Security review built for vibe-coded SaaS slop: apps shipped fast with AI assistance, where the gap between "it works" and "it's safe to expose to the internet" is where attackers live. The premise of the source material is simple — a freshly launched app got probed by an attacker within 3 hours. Bots scan the whole IPv4 space constantly; "nobody knows my URL yet" is not a defense.

This skill turns 50 recurring failure modes into a repeatable audit. Use it to review existing code or harden before a launch.

How to use this skill

1. Scope it. Identify the stack (frontend framework, backend, database, auth provider, hosting) and where secrets live. Most slop vulns cluster around Supabase/Firebase rules, missing server-side authz, and leaked env.
2. Run the audit. Walk every item in references/checklist.md. For each, either confirm it's handled or flag it. Don't skip categories because the app "looks fine" — the dangerous bugs are invisible from the UI.
3. Prove the findings. Where safe and authorized, demonstrate the issue (e.g. fetch another user's row via the API, hit an admin route unauthed, grep the built JS bundle for secrets). A demonstrated bug gets fixed; a theoretical one gets argued about.
4. Prioritize. Score each finding by references/severity.md. Lead with the catastrophic, instantly-exploitable ones (exposed creds, missing authz, open DB rules). Don't bury a P0 IDOR under a missing security header.
5. Fix and re-verify. Apply fixes, then re-test the specific issue.

references/principles.md has all 50 items grouped into 9 categories with the concrete "what to look for" and "how to fix" for each. Read it before auditing.

The non-negotiables (read first)

These cause the majority of real-world breaches in vibe-coded apps. If you do nothing else, verify these:

• No secrets reachable by the client or the public. No .env served, no keys in the frontend bundle, no source maps in prod, no secrets in git history, build logs, or error messages. The browser is hostile territory.
• Every sensitive action is authorized server-side. Authentication ("who are you") is not authorization ("are you allowed"). Frontend checks are UX, not security — the server must re-verify identity, role, ownership, and payment status on every request.
• The database enforces its own access rules. Supabase RLS / Firestore rules / S3 bucket policies must deny by default. "Open read/write so it works in dev" is how user data leaks. Tenant isolation must hold at the data layer.
• User-controlled input is never trusted. Validate on the server. Never trust IDs, roles, prices, or quantities sent by the client. Parameterize queries. Escape output. Verify webhook signatures.

Categories (full detail in references/principles.md)

1. Secrets & exposure (1–3, 10–14, 36) — leaked creds, env, keys, debug pages, source maps.
2. AuthN & AuthZ (4–6, 9, 33–34) — missing/weak auth, no authz, IDOR, trusting client-supplied IDs/roles.
3. Database & storage (7–8, 41, 49) — open rules, misconfigured buckets, excessive DB perms, broken tenant isolation.
4. Injection & input (16–23) — SQLi, NoSQLi, XSS, CSRF, file upload, path traversal, SSRF, missing validation.
5. Sessions, tokens & cookies (24–27, 47) — reset flows, session mgmt, JWT secrets, CORS, cookie flags.
6. Frontend trust boundary (15, 32) — client-side-only checks, frontend payment gating.
7. Rate limiting & exposure surface (28–31, 45) — missing rate limits, public staging, default creds, unsigned webhooks, exposed dashboards.
8. AI-specific (39–40) — prompt injection, AI tools acting without authz.
9. Ops, logging & dependencies (35, 37–38, 42–44, 46, 48, 50) — secret leakage in logs, vuln/outdated deps, no audit/monitoring/backups, missing headers, unencrypted data, over-trusting generated code.

Output

Produce a findings report: references/report-template.md. One row per finding with severity, evidence, and the specific fix. End with a prioritized fix order, not just a list.

Scope & ethics

Only test apps you own or are explicitly authorized to test. This skill is for defensive hardening and authorized review. Demonstrating a vuln on your own app is fine; probing someone else's is not.