CVE-2021-31407: Vaadin Flow

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

Vulnerability in OSGi integration in com.vaadin:flow-server versions 1.2.0 through 2.4.7 (Vaadin 12.0.0 through 14.4.9), and 6.0.0 through 6.0.1 (Vaadin 19.0.0) allows attacker to access application classes and resources on the server via crafted HTTP request.

Affected products

• Vaadin Flow: from 1.2.0, before 2.4.8 (fixed in 2.4.8); from 6.0.0, before 6.0.2 (fixed in 6.0.2)
• Vaadin Vaadin: from 12.0.0, before 14.4.10 (fixed in 14.4.10); version 19.0.0 only

Published 2021-04-23. Last modified 2026-06-17.