---
title: "CVE-2018-19943: QNAP Systems Inc. QTS vulnerability | CubePath"
description: "If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues…"
language: en
source: https://cubepath.com/security/cve/CVE-2018-19943
---

# CVE-2018-19943: QNAP Systems Inc. QTS vulnerability | CubePath

## Description

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

Official description from the CVE record, published by qnap. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-19943)

## Key data

### CVSS 3.1 High 8.0

Score published by qnap in the CVE record.

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

| Metric                 | Value    | What it means                                                                             |
| ---------------------- | -------- | ----------------------------------------------------------------------------------------- |
| Attack vector          | Network  | The vulnerable component can be reached over a network, possibly from the Internet.       |
| Attack complexity      | High     | The attack depends on conditions outside the attacker's control, so it takes preparation. |
| Privileges required    | Low      | A basic user account is needed.                                                           |
| User interaction       | Required | A user has to do something first, such as opening a file or following a link.             |
| Scope                  | Changed  | The impact can reach other components beyond the vulnerable one.                          |
| Confidentiality impact | High     | Serious or total effect on the secrecy of data.                                           |
| Integrity impact       | High     | Serious or total effect on the trustworthiness of data.                                   |
| Availability impact    | High     | Serious or total effect on availability.                                                  |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.22682 (22.7% probability)

Percentile

97.7%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

QNAP NAS File Station Cross-Site Scripting Vulnerability

Added to the catalog

May 24, 2022

Federal due date

Jun 14, 2022

Ransomware campaigns

Known use

### CISA assessment as of Jun 1, 2022

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

no

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-79](https://cwe.mitre.org/data/definitions/79.html) Improper Neutralization of Input During Web Page Generation
- [CWE-80](https://cwe.mitre.org/data/definitions/80.html) Improper Neutralization of Script-Related HTML Tags in a Web Page

## Affected products

Products listed in the CVE record, as the CNA published them.

- QNAP Systems Inc. QTS

  - affected: unspecified up to before 4.4.2.1270
- QNAP Systems Inc. QTS

  - affected: unspecified up to before 4.4.1.1261
  - affected: unspecified up to before 4.3.6.1263
- QNAP Systems Inc. QTS

  - affected: unspecified up to before 4.3.4.1282
- QNAP Systems Inc. QTS

  - affected: unspecified up to before 4.3.3.1252
- QNAP Systems Inc. QTS

  - affected: unspecified up to before 4.2.6

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [qnap.com/zh-tw/security-advisory/qsa-20-01](https://www.qnap.com/zh-tw/security-advisory/qsa-20-01)

## Timeline

1. ID reserved Dec 7, 2018
2. Record published Oct 28, 2020
3. Added to CISA KEV May 24, 2022
4. Record last updated Aug 13, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:01 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)