How to Find Exposed API Keys in a Lovable App

Quick answer: To find exposed API keys in a Lovable app, inspect the browser's Network and Sources tabs for hardcoded strings like "sk-" or "AIza". AI-generated apps often leak secrets by making direct frontend calls to services like OpenAI or Stripe. Use SimplyScan to automatically detect these leaks and rotate compromised keys immediately.

By Gabriel CA · Kraftwire Software

In the era of vibe-coding, speed often comes at the cost of strict architectural boundaries. Lovable is a powerful tool for generating full-stack applications, but its reliance on client-side execution means that sensitive secrets can easily slip into the public browser bundle. When an LLM generates code to call an external service like OpenAI or Stripe, it may hardcode the API key directly into a React component or a utility file. Once deployed, that key is visible to anyone who knows how to look.

Why Do API Keys Leak In Lovable Apps?

The primary reason for credential exposure in Lovable apps is the architectural shift toward client-side logic. In traditional development, a backend server acts as a proxy. The frontend sends a request to the server, and the server uses a hidden environment variable to call the third-party API. In many AI-generated apps, the LLM attempts to simplify this by making the API call directly from the frontend.

When Lovable generates a feature · such as a chatbot or a payment button · it might write code that looks like this:

Because this code runs in the user's browser, the Authorization header is fully transparent. Even if the key is stored in a .env file, if it is prefixed with VITE_ (common in Lovable's Vite-based stack), it will be bundled into the production JavaScript. In SimplyScan's scans of 176 AI-built apps, 32% had at least one high or critical severity issue, often involving the exposure of such credentials or broken access controls.

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.

If the search returns a result in a file like index-D8f2g7.js, your key is public. Attackers use automated scripts to perform this same process across thousands of domains every hour. Beyond just keys, research has shown that architecture security risks in AI apps often lead to the exposure of database schemas and internal API structures within these same bundles.

Is The Supabase Anon Key A Security Risk?

A common point of confusion for Lovable users is the presence of the SUPABASE_ANON_KEY. Unlike an OpenAI secret key, the Supabase anonymous key is intended to be public. It allows the frontend to communicate with your database.

However, the safety of this key depends entirely on Row Level Security (RLS). If RLS is disabled or misconfigured, the anon key allows anyone to read, modify, or delete your entire database. This is a recurring theme in vibe-coding security. In SimplyScan's data, security issues of medium severity appeared in 20% of apps, frequently involving cases where the anon key was public but the underlying data was not properly protected by policies.

To verify your Supabase safety:

• Check if RLS is enabled on every table.
• Ensure no policy allows SELECT or ALL to the anon role without specific conditions.
• Use a Supabase security checklist to audit your policies.

What Are The Most Common Keys Leaked In AI Apps?

Lovable apps frequently integrate with a standard set of third-party providers. Each of these has a specific key format that is easily identifiable by scanners.

• OpenAI/Anthropic: Keys starting with sk- are the most common leaks. These allow attackers to run up massive bills on your account.
• Stripe: While the pk_ (publishable) key is safe, the sk_ (secret) key allows full access to customer data and refunds.
• AWS/Google Cloud: Keys like AKIA... or Firebase service account JSONs provide deep access to infrastructure.
• Mailgun/Resend: Exposed keys allow attackers to send spam or phishing emails from your verified domain.

According to recent reports, Lovable apps have been found to expose complete API endpoint structures in client-side bundles, making it trivial for an attacker to map out the entire backend surface area. This is why understanding environment variables security is critical before moving from a "vibe" to a production-ready product.

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. Rotate the Key Immediately

Go to the provider's dashboard (e.g., OpenAI or Stripe) and revoke the existing key. Generate a new one. This stops any current exploitation.

2. Move Logic to an Edge Function

Instead of calling the API from the frontend, use Supabase Edge Functions or a dedicated backend. The frontend sends a request to your function, and the function · which runs in a secure environment · uses the secret key to talk to the third-party service.

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. Clean Your Git History

If your code was pushed to GitHub, the key is still in the commit history. Use a tool like BFG Repo-Cleaner or git filter-repo to scrub the secret from all previous commits.

How Can You Detect Leaks Automatically?

Manual inspection is prone to human error, especially as an app grows. SimplyScan provides a specialized security scanner for Lovable that automates this process. The engine performs a deep crawl of your application's JavaScript bundles, looking for patterns that match known API key formats, exposed .env files, and weak Supabase configurations.

In SimplyScan's scans of 176 AI-built apps, 11% had high-severity security issues. These are often the "silent killers" like a leaked Resend key or a wide-open Supabase table. By running a scan, which takes about 30 seconds, you get a clear grade across 8 dimensions, including security and architecture security risks.

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

Security researchers have identified specific vulnerabilities in how AI platforms handle default configurations. For instance, CVE-2025-48757 highlighted issues where Lovable-generated projects could inadvertently expose project metadata or follow insecure Supabase RLS defaults.

These vulnerabilities emphasize that while "vibe-coding" allows for rapid prototyping, the underlying infrastructure still requires professional-grade security auditing. Relying on the AI to "know" security best practices is a risk; the AI prioritizes functional code that works immediately, which often means taking the path of least resistance · such as hardcoding a key to avoid a complex backend setup.

How To Prevent Future Credential Leaks?

Prevention starts with a shift in how you prompt the AI. Instead of asking Lovable to "add a chatbot," ask it to "create a Supabase Edge Function to handle OpenAI requests and call it from the frontend."

• Audit your bundles: Regularly check what is being shipped to the browser.
• Use a Security Badge: Displaying a verified security badge can help build trust with users, but only after you have verified that no secrets are leaking.
• Monitor Uptime and Security: Use uptime monitoring and scheduled rescans to ensure that new features don't introduce regressions.
• Follow a Checklist: Keep a vibe-coding security checklist handy during development to ensure you don't miss the basics like RLS or CSP headers.

SimplyScan offers a free site health scanner that detects exposed API keys, missing Supabase RLS, and other AI-specific risks in about 30 seconds with no signup required. It is designed specifically for the unique ways that apps built with Lovable, Bolt.new, and Cursor tend to fail. Whether you are building a small tool or a production SaaS, verifying your security posture is a mandatory step in the modern development lifecycle.

Summary of Best Practices

• Never prefix secret keys with VITE_ in Lovable.
• Always use Edge Functions for third-party API calls.
• Enable RLS on every Supabase table.
• Rotate any key that has ever appeared in a client-side file.
• Use SimplyScan to automate the detection of these flaws.

By following these steps, you can enjoy the speed of AI-assisted development without leaving your application · and your users' data · vulnerable to simple credential theft. For more detailed platform-specific advice, you can explore our guides on Bolt.new security or Base44 security.