Browser Attacks Exploit EDR Blind Spots in SaaS Environments

• •Browser-based attacks are increasingly evading traditional EDR systems.
• •Adversary-in-the-middle phishing techniques are being used to capture credentials.
• •Organizations must enhance their security stacks to monitor browser activity.

Recent reports highlight a significant vulnerability in endpoint detection and response (EDR) systems, particularly in SaaS-heavy environments. Attackers are leveraging browser-based attacks, such as adversary-in-the-middle (AiTM) phishing and malicious browser extensions, to bypass traditional security measures. For instance, the Storm-2755 group targeted Canadian employees by redirecting them to a fake Microsoft 365 login page, capturing credentials and session tokens without triggering EDR alerts. The browser has become the primary access point for sensitive corporate applications, yet many EDR systems fail to monitor actions occurring within browser sessions. This creates a structural blind spot, as many attacks do not generate endpoint artifacts that EDR tools are designed to detect. As a result, organizations are urged to reassess their security strategies to include browser detection and response capabilities.