Contao 4.6.0 before 5.3.54, 5.4.0-RC1 before 5.7.17, and 6.0.0-RC1 before 6.0.6 fails to invalidate existing user sessions when two-factor authentication is enabled or disabled. Because Contao\User::isEqualTo() and serialized session data omit two-factor state, attackers already holding a session keep it after the owner changes 2FA settings.
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