Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 up to and including 5.0.3 (Vaadin 15.0.0 up to and including 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows malicious user to guess a security token for Fusion endpoints via timing attack.
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