Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.
Weakness
According to WASC, “Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.”
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Flow | Vaadin | 5.0.0 (including) | 6.0.0 (excluding) |
| Flow | Vaadin | 6.0.0 (including) | 6.0.5 (excluding) |
| Vaadin | Vaadin | 19.0.0 (including) | 19.0.4 (excluding) |
| Vaadin | Vaadin | 18.0.0 (including) | 18.0.0 (including) |