Laravel Security

Laravel Security Audit

Audit Laravel PHP applications (9, 10, 11, 12).

When this skill applies

• Reviewing Laravel models, controllers, requests, middleware
• Auditing mass assignment patterns
• Reviewing Blade templates for XSS
• Checking auth setup (Sanctum, Passport, Breeze, Jetstream)
• Auditing .env handling and config caching

Workflow

Follow ../_shared/audit-workflow.md.

Phase 1: Stack detection

grep -E '"laravel/framework"' composer.json
php artisan --version 2>/dev/null

Phase 2: Inventory

# Models
find app/Models -name '*.php' 2>/dev/null

# Controllers
find app/Http/Controllers -name '*.php' | head

# Middleware
find app/Http/Middleware -name '*.php'

# Routes
cat routes/web.php routes/api.php 2>/dev/null | head -100

# Auth config
cat config/auth.php 2>/dev/null

# .env presence and gitignore
cat .gitignore | grep -i env

Phase 3: Detection — the checks

Eloquent mass assignment

• LRV-MA-1 Every Eloquent model has $fillable (allowlist) or $guarded set. Default $guarded = [] allows everything.
• LRV-MA-2 Sensitive fields (password, is_admin, email_verified_at, foreign keys to other users) NOT in $fillable.
• LRV-MA-3 No Model::unguard() or Model::unguarded(fn() => ...) in production paths.

class User extends Model {
    // GOOD — explicit allow-list
    protected $fillable = ['name', 'email'];
    
    // password is set via setPasswordAttribute (mutator) with bcrypt
    // is_admin is NEVER mass-assignable
}

Validation

• LRV-VAL-1 Form Request classes (php artisan make:request) used for input validation, not inline $request->validate(...) everywhere (centralizes rules).
• LRV-VAL-2 Rules include format constraints: email, url, uuid, min, max, regex.
• LRV-VAL-3 nullable only on truly optional fields.
• LRV-VAL-4 exists:table,column rule used to validate foreign keys (catches non-existent IDs before query).

SQL injection

• LRV-SQL-1 Query Builder uses bindings:

  // GOOD
  DB::select('SELECT * FROM users WHERE id = ?', [$id]);
  User::where('id', $id)->first();
  
  // BAD
  DB::select("SELECT * FROM users WHERE id = $id");
  

• LRV-SQL-2 whereRaw('column = ' . $value) is injection. Use whereRaw('column = ?', [$value]).
• LRV-SQL-3 Dynamic column names → allowlist (Builder doesn't parameterize identifiers).
• LRV-SQL-4 orderBy($request->sort) without allowlist → injection on identifier.

Blade XSS

• LRV-XSS-1 {{ $var }} auto-escapes. {!! $var !!} does NOT — review every usage.
• LRV-XSS-2 @php blocks with echo lose auto-escape; check e() is called.
• LRV-XSS-3 Html::raw(...) (laravel-collective/html) is the same risk as {!! !!}.

CSRF

• LRV-CSRF-1 VerifyCsrfToken middleware in web group applies to forms.
• LRV-CSRF-2 @csrf directive in all forms.
• LRV-CSRF-3 $except array in VerifyCsrfToken reviewed — webhook endpoints there should have signature verification.
• LRV-CSRF-4 API routes (auth via Sanctum/Passport tokens) don't use the web CSRF; verify auth still robust.

Authentication

• LRV-AUTH-1 Password hashing via Hash::make($password) — uses Bcrypt by default (or Argon2 if configured).
• LRV-AUTH-2 auth middleware on protected routes.
• LRV-AUTH-3 Sanctum: API tokens stored hashed; personal_access_tokens table has the hash.
• LRV-AUTH-4 Passport: client secrets stored hashed.
• LRV-AUTH-5 Password reset throttled, tokens single-use.
• LRV-AUTH-6 Login throttle middleware applied to login route (default throttle:login in 10+).
• LRV-AUTH-7 Email verification (MustVerifyEmail) on sensitive routes.

Authorization (Policies, Gates)

• LRV-AZ-1 Each model has a Policy class; controller actions call $this->authorize('update', $post).
• LRV-AZ-2 Gate::define checks not bypassed by skipping authorize in controller.
• LRV-AZ-3 Resource controller has policy bindings (apiResource with policy).

File uploads

• LRV-UP-1 php.ini upload_max_filesize and post_max_size set sensibly at the PHP level.
• LRV-UP-2 Validation rule 'file' => 'required|mimes:jpg,png,pdf|max:2048' — mimes validates MIME type from extension; for stronger checks use mimetypes rule.
• LRV-UP-3 $request->file()->store(...) — files stored in private disk by default; serving requires signed URLs or auth-gated routes.
• LRV-UP-4 Filenames sanitized (Laravel's store() generates random names by default — safe; don't override with original name).

.env and config

• LRV-ENV-1 .env in .gitignore. Verify with git log .env — should be empty.
• LRV-ENV-2 APP_KEY set (php artisan key:generate). Same key across all instances.
• LRV-ENV-3 APP_DEBUG=false in production. Debug mode shows stack traces with .env variables.
• LRV-ENV-4 php artisan config:cache after deployment so .env changes propagate.
• LRV-ENV-5 config/services.php etc. read from env() ONLY in config files (not in code outside config) so caching works.

Cookies and sessions

• LRV-CK-1 config/session.php — secure => true, http_only => true, same_site => 'lax'.
• LRV-CK-2 Session driver in production not array or file (single-instance only); use Redis / DB / Memcached.
• LRV-CK-3 lifetime reasonable; not days for sensitive apps.

Logging

• LRV-LOG-1 No Log::info($request->all()) patterns that include passwords/tokens.
• LRV-LOG-2 Production log channel doesn't include daily driver with no rotation/retention.

Headers

• LRV-HDR-1 Middleware that sets security headers (custom or bepsvpt/secure-headers package).
• LRV-HDR-2 HTTPS enforced via middleware or web server.

Open redirects

• LRV-OR-1 redirect()->to($request->next) with external URL → open redirect. Validate or use intended() with allowlisted fallback.

Deserialization

• LRV-DES-1 No unserialize($userInput) without allowed_classes option.
• LRV-DES-2 Crypt::decrypt on user input safe (signed) — but the content inside must still be validated.

Telescope / Debugbar in production

• LRV-DBG-1 Laravel Telescope disabled in production OR access-restricted to specific users.
• LRV-DBG-2 Laravel Debugbar disabled in production (APP_DEBUG=false typically handles).

Dependencies

• LRV-DEP-1 Laravel version current (10, 11, 12 supported lines).
• LRV-DEP-2 composer audit clean.

Phase 4: Triage

Critical: $guarded = [] on user model + admin flag; whereRaw with user input concatenated; Telescope in production publicly accessible; APP_DEBUG=true in prod.

Phase 5: Report

Use ../_shared/findings-schema.md. Prefix IDs with LRV-.