Re: [webauthn] largeBlob storage extension can be used to bypass 3p storage restrictions (#1518)

Sorry, I'm not sure how to parse that syntax. Do you mean this...

>(iframes of `foo.com` [...] using the `foo.com` blob) can track users across sites

or this?

>(iframes of `foo.com` embedded on (different sites using the `foo.com` blob)) can track users across sites

If the former, then yes - if the iframe can successfully authenticate a user with a WebAuthn credential (which requires an active user gesture) then the iframe can of course identify the user. But I fail to see what that has to do with the blob.

If the latter, it's not supposed to be possible for different sites to exercise each other's credentials in a compliant browser.

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Received on Tuesday, 17 November 2020 14:15:24 UTC