The 404 That Leaked a Live JWT and Sentry Keys

📰 Medium · Cybersecurity

Learn how a 404 error can leak sensitive information like live JWT and Sentry keys, compromising security

intermediate Published 27 Apr 2026
Action Steps
  1. Test your application's 404 error handling to ensure it doesn't leak sensitive information
  2. Configure your server to return a generic 404 error page without exposing internal credentials
  3. Review your application's logging and monitoring setup to prevent sensitive data from being logged
  4. Use a Web Application Firewall (WAF) to detect and prevent similar vulnerabilities
  5. Implement a security audit to identify and fix potential issues before they are exploited
Who Needs to Know This

Developers, security engineers, and DevOps teams can benefit from understanding this issue to improve their application's security and prevent similar leaks

Key Insight

💡 A 404 error can be more than just an error, it can be a security vulnerability if not handled properly

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🚨 A 404 error can leak live JWT and Sentry keys! 🚨 Learn how to prevent this security vulnerability
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