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Bereket Engida bbeccec036 fix(one-tap): bind ID tokens to a server-issued single-use nonce
The One Tap client forwarded a caller-supplied nonce to Google, but the
callback never passed it to verifyGoogleIdToken, so the nonce claim was
never checked and a captured ID token could be replayed until it expired.

Add POST /one-tap/nonce, which stores a random single-use nonce in the
verification table. The client now fetches it before initializing Google
and sends it back with the ID token. The callback consumes the nonce
before verification, passes it to verifyGoogleIdToken, and rejects a
token that carries a nonce claim when none is presented.

Closes #10926
2026-09-03 22:27:30 -07:00
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