On sites requiring a confirmation step to update a user's email address, the token used to verify the change should only be accessible via the confirmation email, but was otherwise retrievable by the user. Versions affected: 4.5, 4.4 to 4.4.4, 4.3 to 4.3.8, 4.1 to 4.1.14 and earlier unsupported versions Versions fixed: 4.5.1, 4.4.5, 4.3.9 and 4.1.15