---
id: "CVE-2018-19953"
kind: "vulnerability"
aliases: ["CVE-2018-19953"]
title: "QNAP Network Attached Storage (NAS): QNAP NAS File Station Cross-Site Scripting Vulnerability"
severity: "medium"
cvss: 6.1
epss: 0.30527
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "QNAP Network Attached Storage (NAS)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "file-station", "infrastructure", "nas", "qnap", "ransomware", "self-hosted"]
not_affected_if: ["file-station-not-used", "no-qnap-nas"]
published_at: "2020-10-28T18:15:12+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-19953", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-19953", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-19953", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# QNAP Network Attached Storage (NAS): QNAP NAS File Station Cross-Site Scripting Vulnerability

QNAP NAS File Station has a cross-site scripting flaw that lets a remote attacker inject malicious script. The sources say it is exploited in the wild and tagged for ransomware use, so an attacker can run script in a logged-in user's browser session on the NAS.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:QNAP Network Attached Storage (NAS) affected ? fixed ?

## Fix

Apply the QNAP firmware update per the vendor instructions named in the CISA KEV entry; the specific fixed version is unknown from these sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-19953
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2018-19953
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-19953

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_