CVE-2018-19953: QNAP NAS File Station Cross-Site Scripting Vulnerability

Medium severity, CVSS 6.1. Actively exploited: in CISA KEV since 2022-05-24. EPSS: 29% chance of exploitation in the next 30 days.

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.

Affected products

• QNAP QTS: before 4.2.6 (fixed in 4.2.6); from 4.3.1.0013, before 4.3.3.1161 (fixed in 4.3.3.1161); from 4.3.4, before 4.3.4.1190 (fixed in 4.3.4.1190); from 4.3.6, before 4.3.6.1218 (fixed in 4.3.6.1218); from 4.4.0, before 4.4.1.1201 (fixed in 4.4.1.1201); from 4.4.2, before 4.4.2.1231 (fixed in 4.4.2.1231); …

Published 2020-10-28. Last modified 2026-10-01.