Cursor-Generated Code: The 5 Most Common Security Issues We See in Scans

Why Cursor Code Has Consistent Security Patterns

Cursor runs models from Anthropic, OpenAI, Google and its own Composer line to generate code in context, which makes it incredibly productive. But the same models that make Cursor fast also produce predictable security anti-patterns. Because Cursor works inline with your existing code, developers often accept generated blocks without reviewing them - the code appears in context and looks correct.

CodeRabbit's State of AI vs Human Code Generation Report (December 2025) found security issues up to 2.74x higher in AI co-authored pull requests than in human-only ones. A Stanford study found that developers using an AI assistant wrote significantly less secure code, and were more likely to believe it was secure. This confidence gap is amplified with Cursor because the code appears seamlessly in your editor.

Issue 1: SQL Injection via String Interpolation

Cursor frequently generates database queries using template literals instead of parameterized queries. This is the most dangerous pattern because it allows attackers to manipulate your database through crafted input. Injection is still in the OWASP Top 10 (A05 in 2025).

// ❌ BAD - Cursor generates string interpolation in queries
const user = await db.query(
  `SELECT * FROM users WHERE email = '${req.body.email}'`
);

const results = await prisma.$queryRawUnsafe(
  `SELECT * FROM products WHERE name LIKE '%${searchTerm}%'`
);

// ✅ GOOD - Parameterized queries prevent injection
const user = await db.query(
  'SELECT * FROM users WHERE email = $1',
  [req.body.email]
);

const results = await prisma.$queryRaw(
  Prisma.sql`SELECT * FROM products WHERE name LIKE ${`%${searchTerm}%`}`
);

Issue 2: Client-Side Secret Exposure

When working in Next.js projects, Cursor suggests environment variable access with process.env.NEXT_PUBLIC_ for variables that should never be public. The model does not distinguish between browser-safe and server-only secrets. GitGuardian's State of Secrets Sprawl 2024 found 12.8 million new secrets leaked publicly on GitHub in 2023.

// ❌ BAD - Cursor puts secrets in client-side code
const supabase = createClient(
  process.env.NEXT_PUBLIC_SUPABASE_URL,
  process.env.NEXT_PUBLIC_SUPABASE_SERVICE_KEY  // This is the SERVICE key, not anon key
);

// ✅ GOOD - Service key stays server-side only
// In a Server Component or API route:
const supabase = createClient(
  process.env.SUPABASE_URL,        // No NEXT_PUBLIC_ prefix
  process.env.SUPABASE_SERVICE_KEY  // Server-only
);

Issue 3: Missing Input Validation

Cursor generates API route handlers that destructure request bodies directly without any validation. Veracode's State of Software Security 2023 found insufficient input validation flaws in 41.6% of applications scanned with static analysis.

Issue 4: Unprotected API Routes

When you ask Cursor to generate an API endpoint, it creates the business logic but almost never adds authentication middleware. The generated route immediately processes the request without checking who is making it.

Issue 5: Error Handling That Leaks Stack Traces

Cursor's default error handling pattern catches errors and sends them directly to the client, including stack traces, database connection strings, and internal file paths in production.

// ❌ BAD - Cursor's default error handling leaks internals
app.post('/api/data', async (req, res) => {
  try {
    const result = await processData(req.body);
    res.json(result);
  } catch (error) {
    res.status(500).json({ error: error.message, stack: error.stack });
  }
});

// ✅ GOOD - Safe error responses in production
app.post('/api/data', async (req, res) => {
  try {
    const result = await processData(req.body);
    res.json(result);
  } catch (error) {
    console.error('Data processing failed:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

How to Audit Cursor-Generated Code

The most efficient approach is automated scanning. Manually reviewing every Cursor-generated block is impractical when you accept dozens of suggestions per day. VibeDoctor's Vibe Check scans your whole codebase and flags, with file paths and line numbers: interpolated SQL passed to query(), execute(), raw() or knex's whereRaw(); public env vars whose names contain SECRET, PRIVATE or PASSWORD; and Express, Fastify and NestJS routes with no auth middleware, or write routes that use req.body with no validation. It does not flag Prisma's $queryRawUnsafe, a public name like NEXT_PUBLIC_SUPABASE_SERVICE_KEY, or error responses that include error.stack, so use the searches in the table above for those. Free to sign up.

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