title: Directory traversal in development mode handler in Vaadin 14 and 15-17
description: Improper URL validation in development mode handler in com.vaadin:flow-server versions 2.0.0 through 2.4.1 (Vaadin 14.0.0 through 14.4.2), and 3.0 prior to 5.0 (Vaadin 15 prior to 18) allows attacker to request arbitrary files stored outside of intended frontend resources folder.
problem types: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
affected:
{
product: Vaadin
vendor: Vaadin
versions:
changes: [at: 15.0.0, status: affected], lessThan: *, status: affected, version: 14.0.0, versionType: custom
}
{
product: flow-server
vendor: Vaadin
versions:
changes: [at: 3.0.0, status: affected], lessThan: *, status: affected, version: 2.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.9
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
version: 3.1
]