CVE-2021-34359: QNAP NAS Proxy Server

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Proxy Server. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Proxy Server: QTS 4.5.x: Proxy Server 1.4.2 ( 2021/12/30 ) and later

Affected products

• QNAP NAS Proxy Server: before 1.4.2 (fixed in 1.4.2)

Published 2022-02-25. Last modified 2026-06-17.