title: Unauthorized client-side property update in UIDL request handler in Vaadin 10 and 11
description: Missing check in UIDL request handler in com.vaadin:flow-server versions 1.0.0 through 1.0.5 (Vaadin 10.0.0 through 10.0.7, and 11.0.0 through 11.0.2) allows attacker to update element property values via crafted synchronization message.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
product: Vaadin
vendor: Vaadin
versions:
changes: [at: 11.0.0, status: affected], lessThan: *, status: affected, version: 10.0.0, versionType: custom
}
{
product: flow-server
vendor: Vaadin
versions:
lessThan: *, status: affected, version: 1.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 2.6
baseSeverity: LOW
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
version: 3.1
]