Vibe Coding Security Checklist for AI-Built Apps

Define Scope and Evidence Limits

Vibe coding describes building software through natural-language interaction with AI coding tools. It does not change the security responsibilities of the deployed application. A feature that works for the intended user still needs tests for the actions that should be denied.

List the application URLs, APIs, accounts, and environments you are allowed to test. Use staging and dedicated test accounts where possible. Identify third-party systems that are outside scope, and define limits for checks that could send email, create records, spend money, or generate traffic.

This checklist is a starting point for review, not a penetration-testing certification or a guarantee that an application is secure. Adapt it to the data your application handles and the consequences of a failure. A completed checklist is a record of the cases examined, not proof of absolute security.

Keep Secrets Out of the Browser

Inspect the production JavaScript bundle, public configuration, repository history, build artifacts, and source maps for credentials. A secret placed in a frontend environment variable can still become public when the application is built. Browser code cannot keep a privileged API key confidential.

Move privileged credentials to a trusted backend, use provider-scoped permissions, and rotate any exposed key. As noted by the OWASP Secrets Management Cheat Sheet, removing a key from the current file is not enough if it remains valid or appears in earlier commits. Never paste a live secret into a public issue, AI prompt, or sample report.

To minimize the time a secret is in plaintext in memory, consider architectures that support automated rotation. Using dynamic secrets, where an application requests short-lived credentials upon startup, reduces the surface area of credential reuse.

Test the Full Authentication Lifecycle

Review registration, sign-in, email verification, password reset, session expiration, and logout as one connected flow. Password-reset links should be time-limited and single-use. Logout should invalidate the server-side session where the session design requires it.

Check that error messages do not expose account details unnecessarily. An application should respond in a generic manner regardless of whether the user ID is incorrect, the account does not exist, or the account is locked, to prevent user enumeration attacks.

Require re-authentication for sensitive features. To mitigate session hijacking, require current credentials before updating sensitive account information or executing critical transactions.

Enforce Authorization and Boundaries

Authentication establishes who a user is; authorization decides what that user may do. Hiding an admin link or filtering a list in the browser does not protect the underlying endpoint. Enforce access checks in trusted server-side code for reads, writes, downloads, and background actions.

Consider a concrete worked example: A multi-tenant SaaS application handles invoices. User A belongs to Workspace Alpha, and User B belongs to Workspace Beta. A request to fetch an invoice using a direct identifier, such as GET /api/invoices/1042, must verify that the authenticated user's workspace ID matches the invoice's workspace ID on the server. If the server only checks that User B is logged in, User B can access User A's invoice. This is a classic broken access control failure.

Model access controls should enforce record ownership rather than accepting that any authenticated user can create, read, update, or delete any record.

Safe Test Matrix: Allowed and Denied Outcomes

Use this matrix to structure your release evidence. Record the authorized environment, affected route, expected behavior, and safe reproduction steps. Mask secrets and avoid storing customer data during the review.

• Secrets Check: Allowed outcome confirms public configuration works. Denied outcome confirms private test credentials cannot be extracted from the generated browser bundle.
• Session Lifecycle: Allowed outcome confirms a valid test member completes the journey. Denied outcome confirms signed-out, expired, and revoked sessions are safely rejected.
• Record Ownership: Allowed outcome confirms a permitted member reads its synthetic record. Denied outcome confirms a second unprivileged account cannot read that record.
• Workspace Boundary: Allowed outcome confirms controlled accounts read their own workspace fixture. Denied outcome confirms cross-workspace reads and writes are rejected.
• Resource Limits: Allowed outcome confirms a permitted bounded job completes. Denied outcome confirms repeated or oversized requests are rejected safely.

Implementation Tradeoffs and Failure Modes

Implementing strict access controls often involves a tradeoff between performance and security. Querying the database to verify record ownership on every request adds latency. Caching permissions can reduce this latency, but introduces a failure mode where revoked permissions remain active in the cache until expiration.

Another failure mode occurs when updating logic. A patch can close a vulnerability while accidentally denying valid users or leaving a related route exposed. Always retest the original failure and legitimate access paths after deploying a fix. Keep a human reviewer responsible for release decisions.

Relying solely on AI dependency analysis is a common pitfall. Evaluate vulnerable components in the context of how they are reached and used. A generated dependency or build step needs an explicit trust decision from a human operator.

Sources and Acknowledgments

OWASP Secrets Management Cheat Sheet. Guidance on standardizing and centralizing secrets, minimizing secrets in memory, and architectural patterns for automated rotation.

OWASP Authentication Cheat Sheet. Guidance on password strength controls, secure password recovery, transaction authentication, and generic error message responses.

OWASP Top 10:2021 A01 Broken Access Control. Guidance on enforcing record ownership in trusted server-side code and minimizing CORS usage.

Drafted with Gemini and checked for source links, advisory identifiers, structure and unsupported product claims. Examples are synthetic and are not scan results.

Drafted with Gemini and checked for source links, advisory identifiers, structure and unsupported product claims. Examples are synthetic and are not scan results.

• OWASP Secrets Management Cheat Sheet
• OWASP Authentication Cheat Sheet
• OWASP Top 10:2021 A01 Broken Access Control
• Primary reference: owasp.org