---
id: CVE-2018-19953
title: >-
  If exploited, this cross-site scripting vulnerability could allow remote
  attackers to inject malicious code
summary: >-
  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 202001…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
  - CWE-80
  - CWE-79
vendor: qnap
product: qts
affected:
  - qts < 4.2.6
  - 'qts >= 4.3.1.0013, < 4.3.3.1161'
  - 'qts >= 4.3.4, < 4.3.4.1190'
  - 'qts >= 4.3.6, < 4.3.6.1218'
  - 'qts >= 4.4.0, < 4.4.1.1201'
  - 'qts >= 4.4.2, < 4.4.2.1231'
  - qts = 4.2.6
patched:
  - qts 4.4.2.1231
published: '2020-10-28'
updated: '2026-08-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-19953'
references:
  - url: 'https://www.qnap.com/zh-tw/security-advisory/qsa-20-01'
    label: security@qnapsecurity.com.tw
  - url: 'https://www.qnap.com/zh-tw/security-advisory/qsa-20-01'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19953
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
epss: 0.23894
epssPercentile: 0.97769
kev: true
kevDateAdded: '2022-05-24'
kevDueDate: '2022-06-14'
kevRansomware: true
exploited: true
zeroDay: true
ingestedAt: '2026-08-13T06:00:54.979Z'
---

## Overview

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

- `qts < 4.2.6`
- `qts >= 4.3.1.0013, < 4.3.3.1161`
- `qts >= 4.3.4, < 4.3.4.1190`
- `qts >= 4.3.6, < 4.3.6.1218`
- `qts >= 4.4.0, < 4.4.1.1201`
- `qts >= 4.4.2, < 4.4.2.1231`
- `qts = 4.2.6`

## Remediation

Upgrade past the affected range:

- `qts 4.4.2.1231`