faker.helpers.fake can be tricked into arbritary code execution.
Details
fakeEval.resolveProperty resolves properties on functions itself instead of resolving the nested function first.
This can be addressed by recursively calling resolveProperty instead of accessing the property after one iteration.
await enableFaker(); // or import faker
faker.rawDefinitions.test = (() => () => {}); // Any function that returns a function
faker.helpers.fake(`{{test.constructor(alert('PowerLevel: Eval'))}}`);
Impact
The Fake method claims:
It is also NOT possible to use any non-faker methods or plain javascript in such patterns.
Which is objectively false, since any global gets fully accessible in the fake string.