Improperly Controlled Modification of Object Prototype Attributes (‘Prototype Pollution’) in jquery-plugin-query-object 2.2.3 allows a malicious user to inject properties into Object.prototype.
packetstormsecurity.com/files/166299/WordPress-Core-5.9.0-5.9.1-Cross-Site-Scripting.html
github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md
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