CVE-2021-31408

Name of the Vulnerable Software and Affected Versions com.vaadin:flow-client versions 5.0.0 through 6.0.4

Description The Authentication.logout() helper in com.vaadin:flow-client uses an 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.

Recommendations For versions 5.0.0 through 6.0.4, consider disabling the Authentication.logout() helper until a patch is available to prevent local attackers from accessing Fusion endpoints after a user logs out. At the moment, there is no information about a newer version that contains a fix for this vulnerability.