Base44 Security Guide: Critical Vulnerabilities and How to Protect Your App

Quick answer: Review the application’s entity access rules, backend functions, secret handling, and deployed behavior. Test intended permissions with separate accounts and keep secret credentials server-side. Base44’s row-level and field-level rules are service-specific; do not substitute PostgreSQL policy instructions for them.

By Daniel A · Kraftwire Software

Review the application’s entity access rules, backend functions, secret handling, and deployed behavior. Test intended permissions with separate accounts and keep secret credentials server-side. Base44’s row-level and field-level rules are service-specific; do not substitute PostgreSQL policy instructions for them.

Base44 provides managed data entities, authentication, and backend functions. Review the controls used by the actual app, including any external services; a managed backend does not establish that application permissions are correct.

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.

Treat generated code and configuration as implementation changes that require review and tests.

Review Generated Code and Configuration

Inspect where provider credentials are loaded and where requests execute. A secret included in browser-delivered code can be copied regardless of how the code was written.

Inspect deployed entity permissions and test expected allow and deny cases. Do not infer access rules from a working frontend or assume defaults match the application’s requirements. See access-control testing.

Security Risks to Check in a Base44 App

1. Exposed API Keys in Client-Side Code

Keep secret credentials server-side and inspect client bundles and repositories for exposure.

• Risk: A secret provider credential in browser assets can be copied and used within its permissions, potentially exposing data or incurring charges.
• Response: Revoke exposed credentials, investigate usage, and repair the exposure path.
• Server Placement: Use backend functions and protected server-side secret storage. Authenticate and authorize callers, validate inputs, and limit resource use.
• Public Keys: Stripe pk_ keys are intended for public clients; distinguish them from secret credentials. The Secret Scanner checks supported inputs for recognizable patterns.

2. Missing Authentication and Authorization Guards

Test private pages and the APIs they use independently. Hiding an admin link does not stop a caller from requesting the underlying operation.

• Risk: Routes such as /admin/settings or /api/get-all-users may expose sensitive behavior if server permissions are missing.
• Page Behavior: A client route guard can improve navigation, but cannot secure backend data.
• Server Checks: Verify caller identity where required and authorize the requested resource and operation.
• Testing: Use the application security checklist to scope tests, not as proof that the auth flow is correct.

3. Weak Database Access Policies (RLS)

Base44 documents row-level rules for entity records and field-level rules for individual fields. Service-role access bypasses those rules, so backend functions using that access must enforce the permissions they require. See the entity security documentation.

• Risk: Incorrect entity permissions can allow a caller to read or change another user’s private records.
• Operations: Review create access as well as READ, UPDATE, and DELETE; these labels describe operations, not a ready-to-copy rule.
• Policy: An ownership idea such as where user_id == current_user_id is pseudocode, not Base44 rule syntax. Configure the actual ownership, role, and sharing requirements using Base44’s documented rules.
• Public Data: Permit public access only where intended and test that private fields and operations remain restricted.

4. Cross-Site Scripting (XSS) in User Content

XSS depends on how untrusted content reaches browser execution contexts. React’s ordinary text rendering differs from inserting raw HTML; inspect the actual rendering path instead of inferring a flaw from the use of AI.

• Risk: Unsafe output handling can let attacker-controlled content execute script in the application’s origin.
• Text: Prefer safe text rendering and context-appropriate output handling.
• HTML: Review dangerouslySetInnerHTML; when user HTML is required, use a maintained sanitizer such as dompurify with appropriate configuration.
• CSP: Configure and test CSP as an additional browser control. The CSP Evaluator checks supplied directives for supported issues, not every possible bypass.

5. Lack of Rate Limiting and Brute Force Protection

Review resource limits on expensive operations and abuse controls on authentication and public endpoints. The required controls depend on the application and deployment.

• Risk: Repeated requests can consume resources or support credential attacks. Rate limits do not correct a database authorization flaw.
• Controls: Use supported application or deployment controls and test enforcement across instances.
• Limits: Choose limits from operation sensitivity and expected traffic, considering accounts as well as network addresses.
• Additional Protection: A WAF may filter some traffic; it does not replace application authorization or validation.

A Base44 Security Review Checklist

Secrets

Investigate credential-like prefixes such as sk_ or key_ in client assets. Check other exposure paths too; a prefix search cannot prove that no secret exists. See secret inspection.

Auth Guards

Test navigation to private pages such as /dashboard when signed out. A redirect to /login does not by itself enforce backend authorization.

API Security

Define and enforce the access policy for each API operation, including intentionally public actions.

Database

Test Base44 entity and field access against intended public, user, and privileged permissions. Review service-role functions separately.

Headers

Inspect response headers, including X-Frame-Options and Content-Security-Policy, and test their applicability and behavior.

Input

All forms use server-side validation; they do not rely solely on frontend checks.

Sessions

Review the session mechanism actually used. For cookies, evaluate HttpOnly, Secure, and SameSite=Lax against the login flow and CSRF requirements.

Errors

Production error messages do not reveal stack traces or database schemas.

AEO

Check observable crawler and metadata signals with AI Visibility (AEO); the result does not establish indexing or citations.

Scanning

The live URL has been tested with an automated security scanner.

Automated Security Scanning for Base44

Use SimplyScan’s URL scan for supported public observations alongside code review and authenticated tests. An external scan does not replace inspection of private source code or service configuration.

In about 30 seconds, SimplyScan checks supported accessible assets and responses for recognizable secret patterns and returned security headers. It can make bounded anonymous backend observations where discovery supports them. It does not establish all authentication, XSS, CSRF, or entity-rule behavior.

Use the included free rescans within the available allowance to check supported observations after fixes. Test the repaired operation separately; a clear result is not exhaustive verification. A Pro report adds detail for supported findings and remediation guidance.

Answer Engine Optimization (AEO) for Base44 Apps

Inspect the initial HTML, metadata, and crawl permissions of the deployed app. Client-rendered content may be unavailable to a crawler that does not execute the necessary JavaScript; crawler behavior varies.

To review discoverability:

• Use semantic elements such as <article> and <header> where they fit the document.
• Write descriptive metadata that matches the page.
• Use SimplyScan’s AEO tool for supported HTML and crawler-access signals. It does not show exactly what an AI engine indexes or cites.

Performance and Security: The Hidden Link

Measure performance and investigate security implications separately. A slow page alone does not establish an exploitable vulnerability.

79% of the 119 live sites SimplyScan has scanned (94 sites) have at least one medium-severity speed issue, such as render-blocking scripts or no route-based code splitting.

A site with speed issues may not hold up under high traffic.

Measure database behavior and load-test changes before attributing improvements to an optimization. See database security. Check your performance metrics alongside security with our speed optimization guide.

Security Triage and Remediation for Teams

Define a remediation process based on exposure, impact, affected data, and available mitigations. Revoke exposed credentials promptly and investigate their use. Set deadlines for the actual findings rather than assuming every missing header has the same severity.

Summary: Ship Fast, But Ship Securely

Review the generated implementation and the managed services it relies on.

Document which controls the platform provides and which the application team must configure, implement, and test.

Keep secret credentials server-side, test entity permissions and backend functions, and investigate supported scan findings. These steps reduce specific risks without proving the absence of vulnerabilities.

For more platform-specific advice, explore our guides on Windsurf, Cursor, and Lovable.

FAQ

Is Base44 safe to use for production apps?

Assess the application for its intended use. Review Base44 entity and field rules, backend authorization, secrets, and deployed behavior, then test private operations with intended roles. Platform features and a clear scan do not establish that every security requirement is met.

How is Base44 security different from Lovable or Bolt?

Base44 supplies managed entities, authentication, and backend functions. Compare the services and controls used by the actual projects rather than inferring security from the builder name. Test generated implementations and each service’s authorization behavior.

How much can an exposed API key in a Base44 app cost?

Impact depends on the credential’s permissions, enabled operations, provider limits, and actual use. Exposure can permit unauthorized access or usage charges. Revoke the credential, investigate activity, and repair the exposure path; there is no fixed loss amount or timeline for every leak.

How do I test whether my Base44 app's authentication actually works?

With authorization and test data, request private pages such as /dashboard or /settings while signed out, then test relevant operations such as /api/user-data. Also test signed-in users with different permissions. Public responses may be intentional; compare results with the defined access policy.

Should session tokens be stored in localStorage?

Browser storage accessible to page scripts can expose session tokens if XSS occurs. HttpOnly cookies prevent direct script access to the cookie value, but injected script may still make authenticated requests. Review the platform’s supported session design, CSRF controls, and XSS defenses together.

How long does it take to secure a Base44 app?

The work depends on the application and findings. Review the platform’s entity rules, backend authorization, secret handling, and deployment. SimplyScan’s URL scan takes about 30 seconds for supported observable checks; it does not identify every flaw or determine how long remediation will take.