Microsoft Locks Down IE Mode After Hackers Turned Legacy Feature Into Backdoor

Microsoft has significantly enhanced the Internet Explorer (IE) mode within its Edge browser following credible reports in August 2025 that malicious actors were exploiting the backward compatibility feature to facilitate unauthorized device access. The update addresses vulnerabilities where threat actors combined social engineering tactics with unpatched zero-day exploits in IE's JavaScript engine, highlighting the importance of robust security measures in legacy component integration.