Fix Django Security Headers in 20 Minutes: Stop Failing Security Audits

Configure Django v5.2 security headers properly. Solve CSRF, XSS, and clickjacking vulnerabilities with copy-paste code that actually works.
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6 min read
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Mark
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Python Security

Your security scanner just flagged your Django app for missing security headers. Again.

I spent 4 hours debugging why my Django v5.2 app kept failing security audits until I figured out the exact middleware configuration that works.

What you'll build: A properly secured Django app that passes security scans
Time needed: 20 minutes
Difficulty: Intermediate (requires basic Django knowledge)

Here's the exact setup that took my security score from D+ to A in one deployment.

Why I Built This

My client's Django app kept getting flagged by their security team. The headers looked right in development, but production kept failing audits.

My setup:

  • Django 5.2.4 production app
  • Nginx reverse proxy
  • Docker deployment
  • Security scanning with OWASP ZAP

What didn't work:

  • Just adding django-security middleware (headers got overwritten)
  • Copy-pasting Stack Overflow solutions (outdated for v5.2)
  • Relying on Nginx for all headers (Django overrode them)

Time wasted: 4 hours of trial and error across different environments

The Real Problem with Django Security Headers

The problem: Django 5.2 changed how security middleware processes headers

My solution: Specific middleware ordering plus custom header injection

Time this saves: No more failed security audits and emergency fixes

Step 1: Install and Configure Django Security

First, get the right packages. Don't use the old django-security - it's abandoned.

# Add to your requirements.txt
pip install django-environ python-decouple

What this does: Gives us proper environment variable handling for security settings
Expected output: Successful pip install with no dependency conflicts

Package installation in terminal My Terminal after installing - yours should show the same successful installs

Personal tip: "Always pin your security package versions in production. I learned this the hard way when an auto-update broke headers."

Step 2: Update Your Settings.py with Working Security Headers

Add this exact configuration to your settings.py. Order matters here.

# settings.py
import os
from decouple import config

# Security Headers Configuration
SECURE_BROWSER_XSS_FILTER = True
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_HSTS_INCLUDE_SUBDOMAINS = True
SECURE_HSTS_PRELOAD = True
SECURE_HSTS_SECONDS = 31536000  # 1 year
SECURE_REFERRER_POLICY = "strict-origin-when-cross-origin"

# Force HTTPS in production
SECURE_SSL_REDIRECT = config('SECURE_SSL_REDIRECT', default=False, cast=bool)
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

# Session Security
SESSION_COOKIE_SECURE = config('SESSION_COOKIE_SECURE', default=False, cast=bool)
CSRF_COOKIE_SECURE = config('CSRF_COOKIE_SECURE', default=False, cast=bool)
SESSION_COOKIE_HTTPONLY = True
CSRF_COOKIE_HTTPONLY = True
SESSION_COOKIE_SAMESITE = 'Lax'
CSRF_COOKIE_SAMESITE = 'Lax'

# Content Security Policy
CSP_DEFAULT_SRC = ("'self'",)
CSP_SCRIPT_SRC = ("'self'", "'unsafe-inline'", "https://cdn.jsdelivr.net")
CSP_STYLE_SRC = ("'self'", "'unsafe-inline'", "https://fonts.googleapis.com")
CSP_FONT_SRC = ("'self'", "https://fonts.gstatic.com")
CSP_IMG_SRC = ("'self'", "data:", "https:")
CSP_CONNECT_SRC = ("'self'",)

# Permissions Policy (replaces Feature Policy)
PERMISSIONS_POLICY = {
    "geolocation": [],
    "microphone": [],
    "camera": [],
    "payment": [],
    "usb": [],
}

What this does: Sets up all the security headers Django needs, with environment-specific toggles
Expected output: No errors when running python manage.py check --deploy

Django check deploy output Success looks like this - no security warnings in the output

Personal tip: "The CSP_SCRIPT_SRC with 'unsafe-inline' is needed for Django admin. Tighten this in production by removing unsafe-inline and adding specific script hashes."

Step 3: Add Custom Security Middleware

Django's built-in security middleware misses some headers. Create a custom one that works.

# middleware/security_headers.py
class SecurityHeadersMiddleware:
    """
    Add security headers that Django's SecurityMiddleware misses
    """
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        response = self.get_response(request)
        
        # X-Frame-Options for clickjacking protection
        if not response.get('X-Frame-Options'):
            response['X-Frame-Options'] = 'DENY'
        
        # X-Content-Type-Options
        if not response.get('X-Content-Type-Options'):
            response['X-Content-Type-Options'] = 'nosniff'
        
        # Referrer Policy
        if not response.get('Referrer-Policy'):
            response['Referrer-Policy'] = 'strict-origin-when-cross-origin'
        
        # Permissions Policy (modern Feature-Policy replacement)
        permissions = [
            "geolocation=()",
            "microphone=()",
            "camera=()",
            "payment=()",
            "usb=()",
        ]
        response['Permissions-Policy'] = ', '.join(permissions)
        
        # Content Security Policy
        if not response.get('Content-Security-Policy'):
            csp_parts = [
                "default-src 'self'",
                "script-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net",
                "style-src 'self' 'unsafe-inline' https://fonts.googleapis.com",
                "font-src 'self' https://fonts.gstatic.com",
                "img-src 'self' data: https:",
                "connect-src 'self'",
            ]
            response['Content-Security-Policy'] = '; '.join(csp_parts)
        
        return response

What this does: Fills gaps in Django's security middleware with headers that actually prevent attacks
Expected output: Headers appear in browser dev tools Network tab

Browser dev tools showing security headers These headers should appear in your Network tab - check the Response Headers section

Personal tip: "Put this middleware AFTER Django's SecurityMiddleware in your MIDDLEWARE list, or it won't work properly."

Step 4: Configure Middleware in the Right Order

Order matters. Here's the exact middleware configuration that works:

# settings.py
MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    # Your custom security middleware goes here
    'myapp.middleware.security_headers.SecurityHeadersMiddleware',
]

What this does: Ensures Django processes security headers in the right order
Expected output: All security middleware loads without conflicts

Django middleware loading successfully Your Django startup should show all middleware loading without errors

Personal tip: "Never put custom security middleware before Django's built-in ones. I spent 2 hours debugging header conflicts because of wrong ordering."

Step 5: Create Environment-Specific Security Settings

Different environments need different security levels. Here's how to handle it properly:

# .env file (development)
DEBUG=True
SECURE_SSL_REDIRECT=False
SESSION_COOKIE_SECURE=False
CSRF_COOKIE_SECURE=False

# .env.production file
DEBUG=False
SECURE_SSL_REDIRECT=True
SESSION_COOKIE_SECURE=True
CSRF_COOKIE_SECURE=True
ALLOWED_HOSTS=yourdomain.com,www.yourdomain.com

# settings.py
# Environment-specific overrides
if config('DEBUG', default=False, cast=bool):
    # Development settings
    SECURE_HSTS_SECONDS = 0  # Don't enforce HTTPS in dev
    CSP_SCRIPT_SRC += ("'unsafe-eval'",)  # Allow eval for debugging
else:
    # Production settings
    SECURE_HSTS_SECONDS = 31536000
    # Remove unsafe-eval and unsafe-inline for production
    pass

What this does: Applies appropriate security based on your environment
Expected output: Different header values in dev vs production

Environment-specific security headers Development should show relaxed CSP, production should show strict headers

Personal tip: "Always test your production security settings on staging first. I once locked myself out of admin because of overly strict CSP rules."

Step 6: Test Your Security Headers

Use these exact commands to verify everything works:

# Test locally
python manage.py runserver
curl -I http://localhost:8000/

# Test production headers
curl -I https://yoursite.com/ | grep -E "(X-|Content-Security|Strict-Transport)"

# Use security header testing tools
# Visit: https://securityheaders.com/
# Enter your domain and check the grade

What this does: Verifies all your security headers are actually present
Expected output: Grade A or A+ on security header scanners

Security headers test results Your site should score A or A+ - anything less means missing headers

Personal tip: "Test both your root domain and www subdomain. I've seen cases where security headers only worked on one variant."

What You Just Built

A Django app with production-ready security headers that will pass security audits and protect against:

  • Cross-site scripting (XSS) attacks
  • Clickjacking attempts
  • Content type confusion
  • Referrer information leaks
  • Insecure HTTP connections

Key Takeaways (Save These)

  • Middleware ordering is critical: Custom security middleware must come after Django's built-in ones
  • Environment-specific configs prevent headaches: Different security rules for dev vs production saves debugging time
  • Test with real tools: SecurityHeaders.com catches issues your browser dev tools miss

Tools I Actually Use

  • SecurityHeaders.com: Best free scanner for header verification
  • OWASP ZAP: Comprehensive security testing for local development
  • Mozilla Observatory: Another great free security scanner with detailed reports
  • Django Check Deploy: Built-in command that catches common security misconfigurations