Netskope Threat Labs

BROWSER-IE Microsoft Edge prototype JsBuiltInEngineInterfaceExtensionObject use-after-free attempt

IPS-CFWIPS-SWG

2 SIDs: 48778, 51714

First seen
December 2023
Last seen
October 2026

Detects web content that exploits CVE-2019-0568, a use-after-free in Microsoft Edge's scripting engine interface objects that can allow code execution. The rule matches the getter redefinition on Object.prototype with error formatting that public exploits use to free engine objects while they remain in use.