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

> CVE-2018-19943: QNAP NAS File Station Cross-Site Scripting Vulnerability. CVSS 8.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2018-19943
Last updated: 2026-08-13T03:55:39Z

- Published: 2020-10-28 17:55 UTC · Updated: 2026-08-13 03:55 UTC · Assigner: qnap
- CVSS: 8.0 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- EPSS: 22.7%, 98th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-24, federal due date 2022-06-14, ransomware use: Known
- CWE: CWE-79, CWE-80

## 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

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- QNAP Systems Inc.: QTS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-19943)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2018-19943)
- [https://www.qnap.com/zh-tw/security-advisory/qsa-20-01](https://www.qnap.com/zh-tw/security-advisory/qsa-20-01)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2018-19943 · Markdown: https://rewindex.com/cve/CVE-2018-19943.md · JSON: https://rewindex.com/api/v1/cves/CVE-2018-19943 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:17.401Z