Cursor vs. Bolt.new: Comparing Application Security Reviews

Quick answer: Cursor and Bolt.new provide different development workflows, but the application’s security depends on its code and deployed configuration. Review secret handling, access rules, and browser protections, then test allowed and denied actions. Aggregate scan results do not rank the platforms’ security.

By Paula C · Kraftwire Software

Reviewing Cursor and the Application It Builds

Cursor’s editor is based on VS Code and integrates AI-assisted editing. Obtain the software through the official distribution channel and review its permissions and data-handling settings. Evaluate the generated application separately from the editor.

In a vibe-coding workflow, inspect credential handling and access-control code directly. A completed feature does not establish that the application’s security requirements are implemented.

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.

How Does Bolt AI Security Compare To Cursor?

Cursor provides a code editor and agent tools. Bolt.new provides a browser-based development environment using WebContainers. Both can produce code that needs a separate review of its production behavior.

Compare the permissions and data available in each environment:

• Cursor: Review local tools, connected services, and any cloud-agent environment you enable.
• Bolt: Review browser-development and deployment settings separately. A development sandbox does not establish how production secrets or data are protected.

For either workflow, inspect the code, configuration, and access tests of the app you will deploy. The editor or development environment alone does not determine whether user data is protected.

11% of the 119 live sites SimplyScan has scanned (13 sites) have at least one medium-severity architecture issue, such as a library with a known vulnerability or no rate limiting.

Investigate individual findings and their check definitions before attributing a cause or interpreting the aggregate category.

Which security risks in ai-generated code should I check?

Review untrusted inputs, credentials, and the permissions granted to each operation. Do not infer those controls from the tool or model used to produce the code.

1. Exposed API Keys

Keep secret credentials server-side and inspect client bundles and repositories. A .env file is not sufficient if the build exposes its values to the browser. A secret scanner can flag supported credential patterns; investigate the credential’s permissions and revoke exposed secrets.

2. Broken Access Control

Test server-side authorization for protected operations. For example, if /api/user-data accepts a userId parameter, verify that the caller may access the requested data under the app’s ownership or sharing rules. Otherwise it may have a broken access-control flaw.

3. Missing Security Headers

Inspect deployed security headers and test the relevant browser protections.

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.

Missing security headers are one example.

Should You Use Cursor Composer For Sensitive Applications?

Review changes that span frontend and backend files together. If a form changes, check the corresponding server validation and query handling. A mismatch is a reason to investigate; it does not automatically establish code injection.

During that review:

• Inspect the source changes and the assumptions they introduce.
• Use a security checklist to organize tests before deployment.
• Test tenant and user isolation. Where PostgreSQL RLS is used, review the policies and privileges that apply to each request role.

Is Bolt.new Safe For Handling User Data?

Inspect the framework and deployment your Bolt project actually uses. For React content inserted through dangerouslySetInnerHTML, review the source and sanitization of that HTML. A build tool or framework choice does not establish that every input path is safe.

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.

Measure slow requests and large resources separately from security findings. Review unused dependencies for removal based on their actual role in the application.

How To Secure Your App After A Cursor Download?

After building the feature, inspect the deployed behavior as well as the source.

Audit Environment Variables

Inspect git history for exposed secrets and revoke affected credentials. The env file linter checks supplied configuration text; it does not inspect repository history or prove that the build kept values private.

Verify Database Rules

For Supabase, inspect PostgreSQL privileges, RLS state, applicable policies, and bypass roles; the Supabase checklist can guide tests. For Firebase, inspect the relevant Security Rules: a matching allow read, write: if true; grants those operations without an identity restriction. Separately review privileged server access.

Scan the Deployment

Use a dedicated tool like SimplyScan to grade your app across 8 dimensions.

SimplyScan’s free URL scan needs no signup and checks selected public secret patterns, headers, and anonymous backend responses in about 30 seconds. It does not test signed-in cross-user access or replace application-specific authorization tests.

Choosing a Development Workflow

The choice depends on your workflow:

• Cursor: Consider its editor and project tools if they fit the codebase and environment you maintain. Review the Cursor checklist.
• Bolt: Consider its browser-based build and publishing workflow. Review the Bolt security guide alongside the project’s deployment settings.

Pro Monitoring includes Pro scan credits for full reports. See pricing for the allowance associated with your chosen option.

Review the application after relevant code or configuration changes. Pro Monitoring provides uptime checks and scheduled rescans with change alerts; these observations do not establish that every regression or authorization flaw will be found.

Use standalone tools for focused inspection. A JWT debugger decodes claims, which alone does not verify a token, and a CSP evaluator reviews supplied policy directives.

Pro Monitoring costs $24/month.