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Webpack 5 before 5.76.0 does not avoid cross-realm object access. ImportParserPlugin.js mishandles the magic comment feature. An attacker who controls a property of an untrusted object can obtain access to the real global object.

🗓️ 03 Sep 2025 22:00:24Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 4 Views

Webpack 5 before 5.76.0 allows cross-realm access via ImportParserPlugin magic comments to expose the real global object.

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03 Sep 2025 22:00Current
7High risk
Vulners AI Score7
CVSS 3.19.8
EPSS0.01303
SSVC
Webpack vulnerabilityCross realm accessImportParserPluginMagic comments bug
4