Windsurf security checklist: The complete step-by-step breakdown to secure your windsurf app.

Ubserve TeamApril 17, 20263 min read

Focus: Checklist | Risk Level: Critical | Stack: Supabase/Next.js | Detection: Ubserve Runtime Simulation

Focus: Checklist
Risk: Critical
Stack: Supabase/Next.js
Detection: Ubserve Runtime Simulation

Use this Windsurf security checklist before deploy. One Cascade refactor can silently remove auth checks across files and leave production sessions exposed.

Windsurf Cascade can edit many files in one pass, which is powerful and risky when security checks are simplified out of your auth flow.

A developer asked Cascade to simplify an auth flow.

It did exactly that by removing token expiry checks across four files.

The app still worked in happy-path testing, but sessions no longer expired.

This windsurf pre-deploy checklist helps you catch those silent regressions before they hit production. If you also use Cursor or Replit, keep one shared security review standard.

If you are figuring out how to secure a windsurf app, treat multi-file AI edits as high-risk by default. Windsurf security vulnerabilities in vibe coded app security pipelines usually come from hidden diff impact.

What Windsurf doesn't tell you by default

Cascade can rewrite security-critical code across many files in one step.
Auth logic can be simplified out without obvious compile-time failures.
Code context leaves your machine in normal usage, so secret hygiene matters.
Subtle authorization bypasses can be introduced in helper layers, not only middleware.

Secrets & Environment Variables

Keep all production secrets outside prompts and agent chat history.
Use environment managers and never commit .env files created during agent sessions.
Rotate secrets if they were pasted into prompts or debug snippets.
Add secret scanning in CI to catch accidental leakage from generated code.

Authentication & Route Protection

Re-verify middleware after every major Cascade refactor.
Confirm token expiry, issuer, and audience checks still execute.
Test privilege boundaries after any auth "simplification" edits.
Add regression tests for session invalidation and cross-tenant isolation.

Database & Storage Security

Review all generated query changes for missing tenant filters.
Enforce least-privilege service accounts for background tasks.
Check storage access paths for ownership and signed URL enforcement.
Validate migration scripts did not weaken constraints or policies.

Input Validation & XSS

Re-run schema validation coverage after generated form changes.
Sanitize all rendered user content, including markdown and rich text.
Reject unknown payload fields in APIs touched by Cascade.
Test stored XSS and reflected XSS in newly generated UI flows.

CORS & API Configuration

Ensure CORS allowlists were not widened during refactors.
Restrict methods and headers to explicit route requirements.
Validate cookie security flags are still enforced in auth flows.
Remove debug endpoints and verbose error leakage from production builds.

Rate Limiting

Protect login and token endpoints with strict per-IP limits.
Add user-level throttles on expensive mutation and export routes.
Rate-limit AI proxy calls to prevent key abuse and billing spikes.
Alert on anomaly bursts immediately after large agentic edits.

Run Your Security Audit

Want to know which Windsurf-shaped vulnerabilities were quietly introduced into your app during rapid AI shipping?

Run the full Ubserve audit. It maps the exact issues from this checklist to your real codebase, shows where each one was found, and explains why it is exploitable in your current flow.

Then you get a fix-ready prompt for each finding that you can paste directly into Windsurf to patch the vulnerability immediately and re-verify before release.

Audit my app for these vulnerabilities

If you worked through this checklist carefully, you are already ahead of most teams that ship AI-built apps. Most breaches I see are not caused by one dramatic mistake. They happen because small security gaps stack up quietly and no one does a final hard check before launch.

Take a breath, run the audit, fix what it flags, and ship with confidence. That is exactly why we built Ubserve: to give fast-moving builders a real security signal before production, not after a breach.

Samuel,
Founder of Ubserve