Starting with Windows 11 version 24H2, the JScript9Legacy engine replaces the classic JScript engine by default. This change enhances user security and marks the definitive discontinuation of JScript, a technology present since 1996. JScript9Legacy is designed with strict security and modern web standards. It offers improved protection against vulnerabilities like XSS, as well as better performance. Users will not need to adjust their workflows, and support for compatibility issues will be available. JScript, now obsolete, no longer meets current JavaScript standards and was kept primarily for backward compatibility.
Starting with Windows 11 version 24H2, the JScript9Legacy engine will be enabled by default, marking the end of JScript as the standard within the Windows platform.
JScript9Legacy, which is based on JScript9, incorporates modern web standards and stricter security principles, offering better protection against common threats.
Existing script tasks will continue to function normally without any required changes from users, and support for reverting to the old engine is available.
Microsoft retained JScript for backward compatibility until now, but JScript is now considered obsolete due to its inability to meet modern JavaScript security standards.
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