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Vibe Coding · Lección

Detectar brechas de seguridad

Audite las vulnerabilidades más habituales

Detectar brechas de seguridad es una lección gratuita de Vibe Coding en CoddyKit. Esta es la lección 3 de 4. Puedes leer la lección completa abajo gratuitamente — luego la practicas en el navegador con un editor de código integrado y un tutor de IA 24/7. Forma parte de la ruta de aprendizaje de Vibe Coding, y tu progreso se sincroniza en la web y la app de CoddyKit. El curso de Vibe Coding incluye 4 lecciones en total.

Partes de esta lección aún no han sido traducidas y se muestran en inglés.

AI Defaults Are Insecure

Models learn from public code, and most public code prioritizes clarity over safety. The statistical average of that corpus is an app with weak auth and trusting input handling.

So the baseline of generated software is demonstration-grade security. It works, it ships, and it leaks.

Finding the gaps is a deliberate adversarial pass, not something the happy-path demo will ever reveal.

Injection: The Classic

The most common AI-introduced flaw is injection: SQL built by string concatenation, shell commands assembled from user input, templates that interpolate untrusted data.

The generated query looks normal until an attacker sends an apostrophe. Then the query becomes their query.

Hunt for any place where user input is glued into a command, query, or markup string.

Scan this codebase for injection risks: SQL or NoSQL queries built by string concatenation, shell commands assembled from input, and any HTML or template that interpolates untrusted data. For each, show the vulnerable line and rewrite it using parameterized queries or proper escaping.

Broken Authorization

Authentication asks who you are; authorization asks what you may do. Models routinely add login then forget to check ownership on each resource.

The result is the classic IDOR: change the id in the URL and read someone else's data. The endpoint authenticated you, but never verified the record was yours.

Check every data access for an ownership or role check, not just a logged-in check.

Review every endpoint that reads or writes a record by id. For each, confirm there is an authorization check that the current user actually owns or is permitted to access that specific record. List any endpoint that only checks authentication but not ownership.

Secrets in Source

Ask for a working integration and the model will happily paste an API key inline to make the demo run. That key then lives in your git history forever.

Secrets belong in environment variables or a vault, never in committed code, client bundles, or logs.

Sweep for anything that looks like a key, token, or password hardcoded in the tree.

Search the entire repository, including history if possible, for hardcoded secrets: API keys, tokens, passwords, connection strings, and private keys. List each location and the secret type, and tell me which must be rotated because they were already committed.

Trusting the Client

Generated frontends often enforce rules only in the browser: price calculated client-side, role checked in JavaScript, validation done in the form.

An attacker bypasses all of it by calling your API directly. Anything the client computes, the server must recompute and re-verify.

Treat every request as if it came from a hostile script, because it can.

Identify every business rule that is currently enforced only on the client: price or total calculations, role and permission checks, and input validation. For each, add equivalent server-side enforcement and assume the client cannot be trusted.

Weak Input Validation

Models validate the field you mentioned and ignore the rest. Length limits, type checks, allowlists, and format rules get skipped unless requested.

Unbounded input invites denial of service, oversized uploads, and malformed data corrupting downstream systems.

Validate at the trust boundary with explicit allowlists, not blocklists that attackers route around.

Add strict server-side validation to this endpoint using an allowlist approach: enforce types, length and size limits, allowed character sets, and required fields. Reject anything that does not match rather than trying to sanitize bad input into shape.

Verbose Error Leakage

Helpful for debugging, dangerous in production: stack traces, SQL errors, and internal paths returned to the caller hand attackers a map of your system.

Models default to verbose errors because they make the demo easier to fix. Production needs generic messages to users and full detail only in private logs.

Separate what the user sees from what you record.

Find every place where internal error details leak to the client: raw stack traces, database error messages, file paths, or framework debug pages. Replace them with a generic client message and ensure the full detail is logged server-side only.

Missing Rate Limits

Login endpoints, password resets, and expensive queries without rate limiting are open to brute force and abuse. The model rarely adds throttling unasked.

An unlimited login endpoint is a credential-stuffing target. An unlimited search can be a denial-of-service lever.

Identify sensitive and costly endpoints and cap how often they can be called.

List the endpoints that need rate limiting: authentication, password reset, account creation, and any expensive query or external call. Recommend a per-user and per-IP limit for each and show how to enforce it with our middleware.

Dependency Risk

AI may pull in an outdated, abandoned, or even hallucinated package. Typosquatted dependency names are a real supply-chain attack vector.

Every import the model suggests is a trust decision. Verify the package exists, is maintained, and has no known critical vulnerabilities.

Run an audit tool and read what it flags rather than auto-upgrading blindly.

Review the dependencies this code introduced. Confirm each package actually exists and is actively maintained, flag any with known critical vulnerabilities, and watch for typosquatted names that resemble popular packages. Recommend safer alternatives where needed.

Think Like an Attacker

The most powerful prompt reframes the model from builder to adversary. Ask it to attack the code it just wrote.

A threat-modeling pass enumerates how each feature could be abused: what an attacker wants, what they control, and which assumption breaks first.

Adversarial review finds the gaps that constructive review walks right past.

Act as a penetration tester targeting this feature. Build a threat model: what would an attacker want, what inputs do they control, and what is the most damaging realistic attack? Walk through the strongest exploit step by step and tell me the smallest fix that closes it.

Defense in Depth

No single control is enough. Validate input and use parameterized queries and check authorization and limit rates. If one layer fails, the next still holds.

Models tend to add one fix and declare victory. Real hardening layers controls so a single mistake is not catastrophic.

Security is a property of the whole system, reviewed as a whole.

Quick Check

Test your security review instincts.

Recap

AI defaults to insecure code: injection, broken authorization, secrets in source, client-side trust, weak validation, leaky errors, no rate limits, and risky dependencies.

Hunt them with an adversarial pass, threat-model each feature, and layer controls for defense in depth. Next, you will harden the reviewed app for production.

Preguntas frecuentes

¿La lección «Detectar brechas de seguridad» es gratis?

Sí — el texto completo de «Detectar brechas de seguridad» es gratis para leer aquí en la web. Para practicarla de forma interactiva (editor de código integrado y tutor de IA 24/7) y desbloquear el resto del curso de Vibe Coding, actualiza a CoddyKit PRO. El curso de Vibe Coding incluye 4 lecciones en total.

¿Qué aprenderé en «Detectar brechas de seguridad»?

Audite las vulnerabilidades más habituales Practicas Vibe Coding con código real que ejecutas directamente en el navegador, y un tutor de IA 24/7 responde tus preguntas mientras trabajas en la lección.

¿Necesito experiencia previa para empezar Vibe Coding?

No se requiere experiencia previa. Vibe Coding en CoddyKit está estructurado para principiantes hasta estudiantes avanzados, así que puedes empezar aquí o desde el inicio y avanzar a tu ritmo. Esta es la lección 3 de 4.

¿Cuánto tiempo toma la lección «Detectar brechas de seguridad»?

La mayoría de las lecciones de CoddyKit toman alrededor de 5–10 minutos. Cada una es compacta e interactiva, así que avanzas constantemente y retomas exactamente por donde dejaste en la web y la app.

¿Puedo escribir y ejecutar código en esta lección de Vibe Coding?

Sí. Cada lección de Vibe Coding incluye un editor de código integrado, así que escribes y ejecutas código real directamente en tu navegador y obtienes retroalimentación instantánea de IA — sin configuración local necesaria.

Todas las lecciones de este curso

  1. Por qué el código generado por IA necesita revisión
  2. Generar pruebas mediante un prompt
  3. Detectar brechas de seguridad
  4. Preparar para producción
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