[klabb3]

Yes easy mistake to make. But this goes back to HTTP basics: a GET request shouldn’t mutate state. Either don’t consume the link (ie allow reuse), have a user confirm action with POST, send a code instead. There are many alternatives.

Personal favorite? Send a 6-digit code with ~1h expiry, exchange for a refresh token and keep the session for a long time. If you have really high value irreversible actions then you can just confirm with a new code.

Also works if mail client is on a different device.

[dogcomplex]

Send that code autofilled into the destination url form so it's a second POST click to login and sounds good.