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This is fantastic research from Unit42. My takeaway here is that passkeys are still much better than passwords, and Chrome as a credential manager is still a terrible idea. Use a separate password manager.

unit42.paloaltonetworks.comPass the Passkey: A Novel Attack Surface in Passwordless AuthenticationExplore how passkey implementation gaps undermine security when relying parties fail to validate the User Verified flag, reducing MFA to a single factor.

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Let's talk infostealers. If you have a user that somehow gets an infostealer—say, via supply chain attack and no fault of their own—but they have excellent credential hygiene, with MFA for everything sensitive, you might think you dodged a bullet.

But uh oh! If they're using passkeys in Chrome, turns out the stealers now have a way to get a credential that, in many cases, bypasses the MFA requirement. The user "doing the right thing" has now become a liability because of Google's implementation.