There is a serious security flaw in billions of Intel CPUs that can let attackers steal confidential data like passwords and encryption keys. Firmware updates can fix it, but at a potential significant performance loss.
It appears that users in this case include agents such as software. A bit confusing for the general public.
For instance, a malicious app obtained from an app store could use the Downfall attack to steal sensitive information like passwords, encryption keys, and private data such as banking details, personal emails, and messages.
It can theoretically even be exploited via a browser:
[Q] What about web browsers?
[A] In theory, remotely exploiting this vulnerability from the web browser is possible. In practice, demonstrating successful attacks via web browsers requires additional research and engineering efforts.
It appears that users in this case include agents such as software. A bit confusing for the general public.
—Official website
It can theoretically even be exploited via a browser:
—FAQ at the official website