title: Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13
description: Missing output sanitization in default RouteNotFoundError view in com.vaadin:flow-server versions 1.0.0 through 1.0.10 (Vaadin 10.0.0 through 10.0.13), and 1.1.0 through 1.4.2 (Vaadin 11.0.0 through 13.0.5) allows attacker to execute malicious JavaScript via crafted URL
problem types: CWE-81 Improper Neutralization of Script in an Error Message Web Page
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:
changes: [at: 1.1.0, status: affected], lessThan: *, status: affected, version: 1.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.1
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: CHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
version: 3.1
]