CVE-2018-19943: QNAP NAS File Station Cross-Site Scripting Vulnerability

Medium severity, CVSS 5.4. Actively exploited: in CISA KEV since 2022-05-24. EPSS: 21.5% 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 these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later

Affected products

• QNAP QTS: before 4.2.6 (fixed in 4.2.6); from 4.3.1.0013, before 4.3.3.1252 (fixed in 4.3.3.1252); from 4.3.4, before 4.3.4.1282 (fixed in 4.3.4.1282); from 4.3.6, before 4.3.6.1263 (fixed in 4.3.6.1263); from 4.4.0, before 4.4.1.1261 (fixed in 4.4.1.1261); from 4.4.2, before 4.4.2.1270 (fixed in 4.4.2.1270); …

Published 2020-10-28. Last modified 2026-08-13.