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verified publisher icon w3c

Add hybrid fallback URL extension

Open harshlal028 opened this issue 2 months ago • 0 comments

Description

Define a new extension to carry a fallback URL for hybrid transports, allowing the remote device to offer a fallback experience if no passkeys are available on the device.

Requirements

  • Fallback URL must be same-site with RP ID domain (this would currently restrict custom schemes, needs discussion)
  • Restricted to hybrid transports by WebAuthn Client

Expected behavior by remote device will be defined by FIDO CTAP.

harshlal028 avatar Oct 15 '25 18:10 harshlal028