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

Source: https://junglewise.ai/threats/cve-2018-19953-qnap-nas-file-station-cross-site-scripting-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-24. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2018-19953 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2022-05-24

A cross-site scripting (XSS) vulnerability in QNAP NAS File Station allows remote attackers to inject malicious code into web pages. The vulnerability requires user interaction and affects multiple versions of the QTS operating system.

Technologies: [QNAP Network Attached Storage (NAS)](https://junglewise.ai/threats/technologies/network-attached-storage-nas). Vendors: [QNAP](https://junglewise.ai/threats/vendors/qnap).

## Quick answers

**Is CVE-2018-19953 exploited in the wild?** Yes. CVE-2018-19953 is known to be exploited in the wild, first recorded on 24 May 2022. Treat it as urgent.

**How severe is CVE-2018-19953?** Critical severity, with a CVSS score of 6.1, published 24 May 2022.

**Which products and versions are affected?** QNAP QTS < 4.4.2.1231 build 20200302; QNAP QTS < 4.4.1.1201 build 20200130; QNAP QTS < 4.3.6.1218 build 20200214; QNAP QTS < 4.3.4.1190 build 20200107; and 3 more.

**Is there a fix for CVE-2018-19953?** A patch was published on 2020-01-07: Fix released for QTS 4.3.4.1190 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2018-19953 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2018-19953?** Check whether you run QNAP Network Attached Storage (NAS). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- QNAP QTS < 4.4.2.1231 build 20200302
- QNAP QTS < 4.4.1.1201 build 20200130
- QNAP QTS < 4.3.6.1218 build 20200214
- QNAP QTS < 4.3.4.1190 build 20200107
- QNAP QTS < 4.3.3.1161 build 20200109
- QNAP QTS < 4.2.6 build 20200109
- QNAP File Station

## Timeline

- 2020-10-28: disclosed: NVD Published Date
- 2022-05-24: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2020-01-07: patched: Fix released for QTS 4.3.4.1190
- 2020-01-09: patched: Fix released for QTS 4.3.3.1161 and 4.2.6
- 2020-01-30: patched: Fix released for QTS 4.4.1.1201
- 2020-02-14: patched: Fix released for QTS 4.3.6.1218
- 2020-03-02: patched: Fix released for QTS 4.4.2.1231

## Related threats

- [QNAP NAS File Station Command Injection Vulnerability](https://junglewise.ai/threats/cve-2018-19949-qnap-nas-file-station-command-injection-vulnerability)
- [QNAP NAS File Station Cross-Site Scripting Vulnerability](https://junglewise.ai/threats/cve-2018-19943-qnap-nas-file-station-cross-site-scripting-vulnerability)
- [QNAP Network-Attached Storage (NAS) Command Injection Vulnerability](https://junglewise.ai/threats/cve-2020-2509-qnap-network-attached-storage-nas-command-injection-vulnerability)
- [QNAP NAS Improper Authorization Vulnerability](https://junglewise.ai/threats/cve-2021-28799-qnap-nas-improper-authorization-vulnerability)