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jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source object contained an enumerable __proto__ property, it could extend the native Object.prototype.
Use CWE-1321, Jquery vendor hub and Jquery product page to widen CVE-2019-11358 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2020-11023, CVE-2016-10707 and CVE-2020-11022 for nearby disclosures in the same product family.