Multiple Content Security Policy (CSP) Implementation Detected
Description
The application implements multiple Content Security Policy (CSP) configurations that may contain misconfigurations, conflicts, or unintended security weaknesses. While CSP is a critical security mechanism that helps prevent cross-site scripting (XSS) and other code injection attacks, improper implementation can reduce its effectiveness or create compatibility issues. This alert identifies specific CSP issues and provides tailored recommendations for improving the security posture of each detected policy.
Remediation
Review each Content Security Policy issue identified in the alert details and apply the specific remediation guidance provided for each finding. General steps include:
1. Consolidate CSP implementations: Ensure only one CSP is defined per response, either through a single HTTP header or a single meta tag, but not both simultaneously to avoid conflicts.
2. Remove unsafe directives: Eliminate 'unsafe-inline' and 'unsafe-eval' where possible by refactoring inline scripts and styles into external files, and using nonces or hashes for necessary inline content.
3. Apply the principle of least privilege: Restrict source directives to only the domains and protocols actually required by your application.
4. Implement proper CSP headers: Use the Content-Security-Policy HTTP header (not the deprecated X-Content-Security-Policy) with appropriate directives.
Example of a secure CSP header implementation:
Content-Security-Policy: default-src 'self'; script-src 'self' 'nonce-{random}'; style-src 'self' 'nonce-{random}'; img-src 'self' https:; font-src 'self'; connect-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'5. Test thoroughly: After implementing changes, test all application functionality to ensure the CSP doesn't break legitimate features while maintaining security.
Refer to the detailed findings in this alert for specific issues and targeted remediation steps for your implementation.