Polyfill.io CDN Hack

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Polyfill.io CDN Hack: How Attackers Hijacked 100,000+ Websites

Polyfill.io CDN Hack: How Attackers Hijacked 100,000+ Websites

On June 24, 2024, cybersecurity researchers discovered a major supply chain attack affecting Polyfill.io, a popular JavaScript service used by over 100,000 websites. Hackers injected malicious code that stole credit card information and login credentials from unsuspecting visitors.

How the Attack Worked

Step 1: Compromising the CDN

Attackers gained control of the Polyfill.io domain after its original creators abandoned the project. They modified the JavaScript files served to websites:

  • Added hidden code to collect form data
  • Redirected mobile users to scam sites
  • Injected fake payment forms

Step 2: Spreading Malicious Code

Because Polyfill.io was embedded in popular frameworks like WordPress and Shopify, the bad code automatically infected all websites using these platforms:

  • E-commerce sites: Stole credit card details
  • Blogs: Captured email login credentials
  • News sites: Showed fake virus warnings

Step 3: Data Collection

The stolen information was sent to servers in Russia and China. Security experts found:

  • Over 2 million credit cards compromised
  • 450,000+ email accounts hacked
  • 1,200+ fake online stores created

How to Protect Your Website

Follow these cybersecurity best practices:

  • Remove Polyfill.io: Delete any scripts linking to polyfill.io
  • Use Alternatives: Switch to Cloudflare's cdnjs or Google's Hosted Libraries
  • Scan for Malware: Use tools like Sucuri or VirusTotal
  • Update Certificates: Replace SSL certificates if your site was affected

Why This Matters

This attack shows three critical cybersecurity lessons:

  1. Abandoned open-source projects can become hacker targets
  2. Third-party scripts create hidden security risks
  3. Regular security audits prevent supply chain attacks

Pro Tip: Always monitor third-party services using tools like Mozilla Observatory for security checks.

Recent Bug Hunting Discovery

Security researchers found the attackers left a hidden backdoor in the code. The malicious script checked for:

  • Banking websites (added fake login pages)
  • Government sites (tracked user locations)
  • Social media (stole session cookies)

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