title: Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
description: 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.
problem types: CWE-613 Insufficient Session Expiration
affected:
{
product: Vaadin
vendor: Vaadin
versions:
changes: [at: 19.0.0, status: unaffected], lessThan: *, status: affected, version: 18.0.0, versionType: custom
}
{
product: flow-client
vendor: Vaadin
versions:
changes: [at: 6.0.0, status: unaffected], lessThan: *, status: affected, version: 5.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 6.3
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
version: 3.1
]