A browser session on its own could start TOTP enrollment or register a
security key. Combined with a pending secret counting as a factor, that let
a stolen session give itself a second factor, register a passkey with it,
and keep access after the owner changed the password.
TOTP setup and security-key registration now pass on the cookie path only
when the session signed in or completed a second factor in the last five
minutes, or when the body carries a proof in the step-up shape (password,
a confirmed authenticator code, or a passkey or security-key assertion).
The settings cards ask for that proof when the server answers
auth.reproof.required and retry the same call with it. The Bearer path is
unchanged: its elevation already is the proof.
Every route that checks a password or a factor as a re-proof now uses one
verifier and one per-account budget of five attempts per fifteen minutes,
shared with the step-up mint, and records each refused proof as
auth.mfa.failed. Passkey enrollment and password change had neither the
limit (passkey enrollment) nor the audit row (both). A structural test
freezes the set of credential-verifying routes and requires a throttle and
an audit call in each.
Marc-André Bombeck
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