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Windows 11 now uses JScript9Legacy engine for improved security

NO LOC, JUL 10 – Microsoft replaced the outdated JScript engine with JScript9Legacy in Windows 11 24H2 to enhance security against threats like cross-site scripting, improving protection for all users.

Summary by BleepingComputer
Microsoft announced that it has replaced the default scripting engine JScript with the newer and more secure JScript9Legacy on Windows 11 version 24H2 and later.

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It was one of the oldest and most exposed components of Windows. Used since the 1990s to run scripts, JScript is finally replaced by a more modern and better protected version. A change almost invisible, but salutary.

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Microsoft has enabled the JScript9Legacy scripting engine by default in Windows 11 24H2, replacing the old JScript. The new engine is developed based on IE9's Chakra engine, improving performance and security while retaining compatibility. It provides continuous support for enterprise needs and a rollback option to deal with potential problems.

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Tech Spot broke the news in on Thursday, July 10, 2025.
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