5 Browser-Based Attacks Your EDR Won't Catch

Introduction

Endpoint Detection and Response (EDR) tools are essential , but they have blind spots. Here are five browser-based attacks that slip through.

1. Browser-in-the-Browser Phishing

Attackers create fake browser windows inside the real browser to harvest credentials. EDR sees no malicious process.

2. Malicious Extensions

Browser extensions with overly broad permissions can read every page, capture keystrokes, and exfiltrate data , all within the browser sandbox.

3. OAuth Token Theft

Stealing OAuth tokens through malicious consent flows gives attackers persistent access to SaaS apps without triggering endpoint alerts.

4. Clipboard Hijacking

Malicious scripts silently replace clipboard content , swapping crypto addresses, injecting malicious URLs, or capturing copied passwords.

5. SaaS-to-SaaS Data Exfiltration

Data moved between sanctioned SaaS apps through the browser never touches the endpoint's file system, making it invisible to EDR.

The Solution

Browser-native security monitoring detects these attacks at the source , inside the browser itself.