Comment by jt2190
5 days ago
Can you provide details on this attack?
Typically the user gives a website their public passkey, which does not need to be kept secret since it’s public. If the website is hacked the attackers only get information that is already public.
You seem to be talking about a scenario where a user’s private keychain on their computer is compromised and the attacker is able to access other systems from that same machine without the user’s knowledge. (Note that the keychain data is itself encrypted so can’t be used from a different computer.)
There are a lot of examples of attacks and bypasses, but this one is probably the worst I've seen so far https://www.techtimes.com/articles/323093/20260805/google-pa...
It's not just the end user that you have to worry about, attacks are helped by the fact that websites suck at passkeys too
"...we developed PASSKEYS-ATTACKER. The tool allows for precise manipulation of WebAuthn messages at every step of the protocol and integrates 15 attack types of which 10 were not covered in previous work. Among them, 2 attack types have critical CVSS scores. We discovered them on 18 out of 103 evaluated websites. These attacks take over user accounts, delete their passkeys, or lock them out of their accounts. Nearly half of the tested sites (53) were vulnerable to at least one attack with a high CVSS score, exposing users to threats such as phishing and session fixation." https://www.usenix.org/conference/usenixsecurity26/presentat...