JavaScript via CDN without Subresource Integrity
- December 7, 2025
- Security, Resource Integrity
Quick Reference
Element Code: SE-003
Issue: CDN-hosted scripts lack integrity attributes
Impact: Vulnerable to CDN compromise or injection attacks
Fix: Add integrity attribute with hash to CDN script tags
Detection: Security audits, CSP reports
What Is This Issue?
When loading JavaScript from CDNs without Subresource Integrity (SRI), you trust the CDN completely. If the CDN is compromised, malicious code could be injected into your site.
Why This Matters for Your Website
CDN compromises have happened. SRI ensures scripts have not been tampered with by verifying their hash.
How to Fix This Issue
- Generate hash: Use SHA-384 or SHA-512
- Add integrity attribute: Include hash in script tag
- Add crossorigin: Required for SRI to work
Tools for Detection
- SRI Hash Generator: Generate integrity hashes
TL;DR (The Simple Version)
Your CDN scripts lack integrity checks. Add integrity attributes with hashes so browsers can verify scripts have not been tampered with.
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