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.

- https://vaadin.com/security/cve-2020-36321

Affected Packages

Maven com.vaadin:flow-server

Affected versions: 3.0.0 (fixed in 5.0.0)

Maven com.vaadin:flow-server

Affected versions: 2.0.0 (fixed in 2.4.2)

Related CVEs

CVE-2020-36321

Key Information

GHSA ID

GHSA-49r2-73m6-pp8f

Published

April 19, 2021 2:51 PM

Last Modified

April 23, 2021 5:13 PM

CVSS Score

5.0 /10

Primary Ecosystem

Maven

Primary Package

com.vaadin:flow-server

GitHub Reviewed

✓ Yes

Dataset

Last updated: July 6, 2025 6:30 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.