Firebase PWA Security Audit: XSS via innerHTML, Hardcoded Credentials and a Custom Token Migration

📰 Dev.to · Andrea Roversi

Learn to identify and fix 3 critical security vulnerabilities in a Firebase PWA, including XSS via innerHTML and hardcoded credentials

intermediate Published 2 Jul 2026
Action Steps
  1. Identify potential XSS vulnerabilities via innerHTML in your Firebase PWA code
  2. Search for and remove hardcoded credentials from your codebase
  3. Implement a custom token migration to prevent unauthorized access
Who Needs to Know This

Developers and security teams working with Firebase PWAs can benefit from this audit to ensure the security of their applications

Key Insight

💡 Using innerHTML can introduce XSS vulnerabilities, and hardcoded credentials can be easily exploited by attackers

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🚨 Fix these 3 critical security vulnerabilities in your Firebase PWA: XSS via innerHTML, hardcoded credentials, and custom token migration 🚨

Key Takeaways

Learn to identify and fix 3 critical security vulnerabilities in a Firebase PWA, including XSS via innerHTML and hardcoded credentials

Full Article

Three vulnerabilities found in priority order in a vanilla JS Firebase management panel: XSS via...
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