How to Find Exposed API Keys in a Lovable App

Quick answer: Inspect a Lovable app’s browser-visible bundles and requests for secret credentials. Prefix matches are clues, not proof that a value is a valid secret. Keep privileged credentials on a protected backend, review repository history, and revoke any secrets that were exposed.

By Gabriel CA · Kraftwire Software

A secret placed in browser code can be read by users of the deployed application. Review each integration in a Lovable app to distinguish public client configuration from privileged credentials and to identify where authenticated server operations are needed.

Why Do API Keys Leak In Lovable Apps?

A .env file does not make a value private if the build exposes it to the client. In a Vite project, VITE_ marks public configuration by default. For operations requiring secret credentials, use a backend that authenticates and authorizes requests before calling the provider.

This intentionally incomplete example illustrates an exposed credential in browser code. It is not a working API request: the method is omitted, and a request body requires an appropriate method. Regardless of whether the request succeeds, the credential string can be read from the shipped source.

The Authorization value is available to anyone inspecting the browser request or shipped source. Protect the credential on the server and verify that your backend authorizes each use of it.

These live figures describe all scanned sites. They do not establish prevalence for an AI-built subgroup, compare development methods, or attribute findings to AI generation.

30% of the 119 live sites SimplyScan has scanned (36 sites) have at least one high or critical security issue.

The aggregate figure does not establish how many sites exposed credentials or why a particular app has a finding. Inspect your own deployment directly.

How To Find Exposed API Keys Using Browser DevTools?

You do not need sophisticated hacking tools to find leaked secrets in a Lovable application. Any visitor can use the built-in developer tools in Chrome, Firefox, or Edge.

• Open your deployed Lovable app.
• Right-click and select Inspect or press F12.
• Navigate to the Sources tab (Chrome) or Debugger tab (Firefox).
• Press Ctrl+Shift+F (Windows) or Cmd+Shift+F (Mac) to search across all files.
• Search for common key prefixes like sk-, key-, AIza, or secret.

A prefix match in a file such as index-D8f2g7.js needs investigation: it may be a placeholder, a public identifier, or a real secret. If a privileged credential is public, revoke it and assess misuse. See architecture security risks for related boundaries.

Is The Supabase Anon Key A Security Risk?

The SUPABASE_ANON_KEY is intended for client use. It identifies the project’s anonymous access path; when a user session is supplied, the effective database role and policies can differ. Keep service-role credentials separate and server-side.

Review both table privileges and Row Level Security (RLS) policies to determine the access available through this key. With RLS disabled, access depends on table privileges; it is not automatically public. This is a recurring theme in vibe-coding security.

29% of the 119 live sites SimplyScan has scanned (35 sites) have at least one medium-severity web-security issue, such as a missing Content-Security-Policy or HSTS header.

To review Supabase access:

• Inventory the tables reachable through the client API and their grants.
• Check RLS state and applicable policies; RLS enabled without policies denies access to roles subject to it.
• Review any SELECT or ALL policy for the anon role against the data’s intended audience. Public read access can be intentional.
• Test permitted and denied operations, including authenticated users and bypass roles, using the Supabase security checklist.

Which Keys Leaked In AI Apps Should You Check?

Inventory each connected service and distinguish its secret credentials from publishable identifiers. Scanner patterns cover supported formats; they cannot establish the permissions or validity of every matching string.

• OpenAI/Anthropic: Provider secrets can permit billable API use within their scope. A prefix such as sk- is a clue to inspect, not proof of an active key.
• Stripe: A pk_ publishable key is intended for client use. A secret such as an sk_ key needs server-side handling; assess permissions, account context, and mode.
• AWS/Google Cloud: An identifier such as AKIA... is not sufficient by itself for AWS signing. Assess access-key pairs, service-account credentials, roles, and restrictions.
• Mailgun/Resend: Exposed sending credentials can permit unauthorized email within their permissions.

Client bundles can reveal route names and data structures. Their visibility is not itself a vulnerability; backend authorization must hold even when an attacker knows the endpoint. Review environment-variable handling and access controls separately.

How To Fix An Exposed API Key In Lovable?

If you find a secret key in your frontend code, you must treat it as compromised. Simply removing the code is not enough.

1. Revoke the Exposed Credential

Revoke it at the provider, generate a replacement where needed, and update deployments. Investigate usage and any secondary credentials or sessions an attacker may have obtained; revocation does not undo prior misuse.

2. Move Privileged Operations to a Backend

Use an Edge Function or another trusted backend for calls requiring a secret. Authenticate and authorize callers, validate inputs, and apply abuse limits. Merely forwarding requests through a function can leave an open relay.

3. Use Server-Side Environment Variables

Ensure your secrets are stored in environment variables that are not accessible to the client. In a Vite environment, avoid the VITE_ prefix for any variable that should remain secret.

4. Review Repository History

If a secret entered Git history, deleting the current file does not remove earlier copies. After revocation, coordinate cleanup using BFG Repo-Cleaner or git filter-repo as appropriate. Review branches, tags, artifacts, and shared copies; a history rewrite cannot guarantee erasure everywhere.

How Can You Detect Leaks Automatically?

The Lovable URL scanner checks supported secret patterns in selected reachable public resources and probes selected exposed-file paths, including .env. It also reports bounded anonymous backend-exposure signals. It does not crawl every asset or verify the correctness of every RLS policy.

13% of the 119 live sites SimplyScan has scanned (15 sites) have at least one high-severity web-security issue, such as a missing Content-Security-Policy or HSTS header.

The free scan typically takes about 30 seconds across 8 categories. Inspect individual findings and their coverage; an aggregate grade does not establish whether a secret is exposed or an access-control policy is correct.

What Is The Impact Of CVE-2025-48757 On Lovable Apps?

CVE-2025-48757 concerns reported authorization weaknesses involving Supabase access in affected projects. The CVE record is disputed. It does not establish that every Lovable project is vulnerable; evaluate the actual grants, policies, and roles in your deployment.

Review configuration and test access with the roles your application uses. A platform update or a clean anonymous URL scan does not prove that an existing project’s authorization rules are correct.

How To Prevent Future Credential Leaks?

When requesting a feature, specify where secret credentials may be used and which callers may invoke the operation. Review and test the generated implementation; a prompt is an instruction, not evidence that the boundary is enforced.

• Audit your bundles: Regularly check what is being shipped to the browser.
• A verified security badge links to a dated scan’s score and eligibility state, subject to the badge criteria. It does not prove the absence of vulnerabilities.
• Monitor Uptime and Security: Use uptime monitoring to detect availability failures and alerts to investigate changes. It does not prevent outages or establish that security controls are working. See uptime monitoring.
• Follow a Checklist: Use the checklist to organize configuration review and manual testing. Investigate the findings and assess risks outside automated coverage. See vibe-coding security checklist.

SimplyScan’s free URL scan requires no signup and reports supported public-facing findings. Test authenticated behavior, server-only code paths, and credential permissions separately.

Summary of Review Steps

• Keep privileged secrets out of client configuration, including VITE_ variables.
• Protect backend endpoints used for private provider calls.
• Review grants, RLS state, policies, and bypass roles for exposed database access.
• Revoke secrets that reached public resources and investigate misuse.
• Use SimplyScan for its supported checks alongside direct tests.

Repeat the relevant checks after changes to integrations, deployment configuration, or permissions. Related guides cover Bolt.new security and Base44 security.