Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Flow | Vaadin | 3.0.0 (including) | 5.0.4 (excluding) |
| Flow | Vaadin | 6.0.0 (including) | 6.0.0 (including) |
| Vaadin | Vaadin | 15.0.0 (including) | 18.0.7 (excluding) |
| Vaadin | Vaadin | 19.0.0 (including) | 19.0.0 (including) |