By far, the most commonly-reported “vulnerability” reported to the Chrome Vulnerability Rewards program boils down to “I can steal my own password.” Despite having its very own FAQ entry, this gets reported to the VRP at varying levels of breathlessness, sometimes multiple times per day.
You can see this “attack” in action:
Yes, it’s true, you can use Chrome to steal your own password.
PS: “But… but… what if I don’t want to use this easy trick and instead steal my own passwords from myself by installing some software on my own PC? Isn’t that a security bug?”