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

Microsoft said it has revamped the Internet Explorer (IE) mode in its Edge browser after receiving “credible reports” in August 2025 that unknown threat actors were abusing the backward compatibility feature to gain unauthorized access to users’ devices.
“Threat actors were leveraging basic social engineering techniques alongside unpatched (0-day) exploits in Internet Explorer’s JavaScript

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