Website Security Check

Measure your website security and help protect your users' sensitive data with our free tool. Utilizing industry best practice, Devunus scans your website's security headers and configuration to identify vulnerabilities, while providing recommendations to enhance your website security.

Website Security Check Tool

Enter your website URL to check its security headers and configuration

This tool is provided 'as is' without any warranty of any kind.

Frequently Asked Questions

Everything you need to know about website security and compliance

  • What is website security?

    Website security is the protection of websites and web applications from cyber threats and vulnerabilities. It includes measures to protect sensitive data, prevent unauthorized access, and maintain the integrity and availability of web services. Key aspects include secure coding practices, proper configuration of security headers, regular updates, and implementing protective measures like WAF (Web Application Firewall).

  • How to check website security?

    The easiest way to check your website security is to enter your website URL above, which will scan for vulnerabilities and security headers. For a comprehensive security assessment, you should: 1) Verify HTTP security headers implementation 2) Check SSL/TLS configuration 3) Review access controls and authentication mechanisms 4) Conduct regular penetration testing 5) Monitor server logs for suspicious activities 6) Verify compliance with security standards.

  • What compliance standards should my website meet (PCI, SOC, ISO27001)?

    Different compliance standards apply based on your business type: PCI DSS is mandatory if you handle credit card data, SOC 2 demonstrates secure data handling practices, and ISO 27001 provides a framework for information security management. Each standard has specific requirements for security controls, monitoring, and documentation.

  • What are HTTP headers?

    HTTP headers are key-value pairs sent in HTTP requests and responses that provide essential information about the transaction and security controls. Security-related headers help protect against common web vulnerabilities like XSS, CSRF, and clickjacking by instructing browsers how to handle the website's content.

  • Which HTTP security headers are required?

    Essential security headers include: Content-Security-Policy (CSP) to prevent XSS attacks, X-Frame-Options to prevent clickjacking, Strict-Transport-Security (HSTS) to enforce HTTPS, X-Content-Type-Options to prevent MIME-type sniffing, and X-XSS-Protection for additional XSS protection. The specific headers needed depend on your application's requirements.

  • How to configure HTTP headers?

    HTTP headers can be configured at different levels: 1) Web server configuration (Apache, Nginx) 2) Application code 3) Cloud platform settings 4) Content Delivery Network (CDN) configuration. The implementation method depends on your hosting environment and technology stack. Always test header configurations in a staging environment first.

  • Why is a WAF (Web Application Firewall) required?

    A WAF provides an additional security layer by filtering and monitoring HTTP traffic between web applications and the Internet. It protects against common web exploits like SQL injection, cross-site scripting (XSS), file inclusion, and security misconfigurations. WAFs can also help with DDoS protection and ensure compliance with security standards.

  • How important is keeping dependencies updated?

    Regular updates of dependencies (packages, CMS, plugins) is crucial for security because: 1) It patches known vulnerabilities 2) Fixes security bugs 3) Implements latest security features 4) Ensures compatibility with security standards. Outdated dependencies are a common attack vector for cybercriminals.

Understanding Website Security

Website security is a critical aspect of modern web development that protects your site, users, and data from various cyber threats. Our security checker analyzes your website's HTTP headers and configuration to identify potential vulnerabilities and provide actionable recommendations.

Key Security Headers Explained

Content Security Policy (CSP)

Content Security Policy is a critical security standard that helps prevent various types of attacks, including Cross-Site Scripting (XSS) and other code injection attacks. CSP works by specifying which content sources are allowed to be loaded by the browser, effectively creating a whitelist of trusted sources.

A properly configured CSP header can prevent malicious scripts from executing, block unwanted iframe embedding, and control which resources can be loaded from external domains. Common CSP directives include:

  • default-src: Fallback for other fetch directives
  • script-src: Controls which JavaScript sources can be executed
  • style-src: Controls which CSS sources can be applied
  • img-src: Controls which image sources can be loaded
  • connect-src: Controls which URLs the site can connect to via script interfaces
  • frame-ancestors: Controls which parent pages can embed the site in iframes

HTTP Strict Transport Security (HSTS)

HSTS is a security policy mechanism that helps protect websites against protocol downgrade attacks and cookie hijacking. It instructs web browsers to only connect to the website using HTTPS, preventing insecure HTTP connections.

When properly configured, HSTS includes:

  • max-age: How long the browser should remember to only connect via HTTPS (recommended: at least 6 months)
  • includeSubDomains: Applies the policy to all subdomains
  • preload: Allows the domain to be included in browser HSTS preload lists

X-Frame-Options and CSP frame-ancestors

These headers protect against clickjacking attacks by controlling whether a page can be embedded in an iframe. Clickjacking occurs when an attacker tricks a user into clicking on something different from what the user perceives they are clicking on.

While X-Frame-Options is the older method, CSP frame-ancestors is the modern approach that provides more granular control. Common values include:

  • DENY: Prevents the page from being displayed in a frame
  • SAMEORIGIN: Allows the page to be displayed in a frame only if the parent page is from the same origin
  • frame-ancestors 'none': Modern equivalent of DENY
  • frame-ancestors 'self': Modern equivalent of SAMEORIGIN

Referrer-Policy

The Referrer-Policy header controls how much referrer information is included with requests. This helps protect user privacy by limiting the amount of information leaked to third-party sites.

Recommended values include:

  • strict-origin-when-cross-origin: Sends the origin for same-origin requests, and only the origin for cross-origin requests
  • same-origin: Only sends the referrer for same-origin requests
  • no-referrer: Never sends the referrer information

Cookie Security

Secure cookie configuration is essential for protecting user sessions and sensitive data. Our checker examines cookie attributes to ensure they follow security best practices.

Critical cookie security attributes include:

  • Secure: Ensures cookies are only sent over HTTPS connections
  • HttpOnly: Prevents JavaScript access to cookies, protecting against XSS attacks
  • SameSite: Controls when cookies are sent with cross-site requests (Strict, Lax, or None)
  • Expires/Max-Age: Sets appropriate expiration times for session management

Web Application Firewall (WAF)

A Web Application Firewall provides an additional security layer by filtering and monitoring HTTP traffic between web applications and the Internet. It protects against common web exploits like SQL injection, cross-site scripting (XSS), file inclusion, and security misconfigurations.

Popular WAF solutions include:

  • Cloudflare WAF
  • AWS WAF
  • Azure Front Door
  • Imperva/Incapsula
  • Sucuri

Common Web Vulnerabilities

Cross-Site Scripting (XSS)

XSS attacks occur when an attacker injects malicious scripts into web pages viewed by other users. These attacks can steal cookies, session tokens, or other sensitive information.

Prevention measures include:

  • Implementing Content Security Policy (CSP)
  • Proper input validation and output encoding
  • Using HttpOnly cookies
  • Implementing X-XSS-Protection header

SQL Injection

SQL injection attacks occur when an attacker manipulates a site's database queries by injecting malicious SQL code. This can lead to unauthorized data access, data manipulation, or even complete database compromise.

Prevention measures include:

  • Using parameterized queries or prepared statements
  • Input validation and sanitization
  • Implementing a WAF
  • Using an ORM (Object-Relational Mapping) framework

Cross-Site Request Forgery (CSRF)

CSRF attacks occur when an attacker tricks a user's browser into making unauthorized requests to a site where the user is authenticated. This can lead to unwanted actions being performed on behalf of the user.

Prevention measures include:

  • Implementing CSRF tokens
  • Using SameSite cookie attributes
  • Validating the Origin and Referer headers
  • Implementing proper authentication mechanisms

Security Compliance Standards

PCI DSS (Payment Card Industry Data Security Standard)

PCI DSS is a set of security standards designed to ensure that all companies that accept, process, store, or transmit credit card information maintain a secure environment.

Key requirements include:

  • Building and maintaining a secure network
  • Protecting cardholder data
  • Maintaining a vulnerability management program
  • Implementing strong access control measures
  • Regularly monitoring and testing networks
  • Maintaining an information security policy

GDPR (General Data Protection Regulation)

GDPR is a comprehensive data protection regulation that applies to all companies processing the personal data of EU residents. It requires organizations to implement appropriate technical and organizational measures to protect personal data.

Key security requirements include:

  • Encryption of personal data
  • Regular security assessments
  • Access controls and authentication
  • Data backup and recovery procedures
  • Incident response plans

SOC 2 (Service Organization Control 2)

SOC 2 is a rigorous auditing procedure developed by the American Institute of CPAs (AICPA) for service organizations. It focuses on five trust service criteria: security, availability, processing integrity, confidentiality, and privacy.

Security criteria include:

  • Logical and physical access controls
  • System operations
  • Change management
  • Risk mitigation

Security Best Practices

Regular Security Assessments

Conducting regular security assessments is essential for identifying and addressing vulnerabilities before they can be exploited. This includes:

  • Automated vulnerability scanning
  • Manual penetration testing
  • Code security reviews
  • Configuration audits
  • Dependency vulnerability checks

Secure Development Lifecycle

Implementing a secure development lifecycle (SDL) helps ensure that security is built into applications from the ground up. Key components include:

  • Security training for developers
  • Threat modeling
  • Secure coding guidelines
  • Security code reviews
  • Security testing
  • Incident response planning

Dependency Management

Keeping dependencies up-to-date is crucial for security, as outdated packages often contain known vulnerabilities. Best practices include:

  • Regular dependency updates
  • Automated vulnerability scanning for dependencies
  • Using dependency lock files
  • Implementing a patch management process
  • Monitoring security advisories for critical dependencies

Incident Response Planning

Having a well-defined incident response plan is essential for effectively handling security incidents. Key components include:

  • Incident detection and reporting procedures
  • Roles and responsibilities
  • Communication plans
  • Containment and eradication procedures
  • Recovery and lessons learned