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CVE-2018-19953

6.1, medium Known exploited Used in ransomware

QNAP NAS File Station Cross-Site Scripting Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
6.1, medium medium CVSS v3.1
EPSS, next 30 days
29% higher than 98.1% of scored CVEs
Exploitation
Confirmed in the wild
Published
28 Oct 20205 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 24 May 2022 and links it to ransomware activity. US federal agencies had to remediate by 14 Jun 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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.

Details

Vendor
QNAP
Product
QTS
Weakness
CWE-79 (opens in a new tab)
Status
Analyzed
Updated
1 Oct 2026
Assigner
security@qnapsecurity.com.tw

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other QNAP CVEs

Every QNAP CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2023-47565 QNAP VioStor NVR OS Command Injection Vulnerability KEV EPSS 73% 8.8, high
  • CVE-2022-27593 QNAP Photo Station Externally Controlled Reference Vulnerability KEV EPSS 88% 9.1, critical
  • CVE-2021-28799 QNAP NAS Improper Authorization Vulnerability KEV EPSS 78% 9.8, critical
  • CVE-2020-2509 QNAP Network-Attached Storage (NAS) Command Injection Vulnerability KEV EPSS 34% 9.8, critical
  • CVE-2018-19943 QNAP NAS File Station Cross-Site Scripting Vulnerability KEV EPSS 21% 5.4, medium
  • CVE-2018-19949 QNAP NAS File Station Command Injection Vulnerability KEV EPSS 29% 9.8, critical
  • CVE-2019-7192 QNAP Photo Station Improper Access Control Vulnerability KEV EPSS 88% 9.8, critical
  • CVE-2019-7193 QNAP QTS Improper Input Validation Vulnerability KEV EPSS 14% 9.8, critical

Beyond this page

Is CVE-2018-19953 in your network?

This page tells you how dangerous CVE-2018-19953 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2018-19953 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2018-19953 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.