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

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.

6.1 MEDIUMEPSS 30.52%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-01 20:17 UTC

OverviewCVSS details

6.1MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Oct 28, 2020
Assigner: qnap

Affected

QTS (QNAP Systems Inc.)

Versions: before 4.4.2.1231
Fixed in: 4.4.2.1231

+4 more products →

Exploitation

Public exploit: None listed
CISA KEV: Listed · May 24, 2022
KEV due date: Jun 14, 2022
Ransomware use: Known
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

30.52%chance of exploitation in 30 days

Higher than 98.24% of CVEs

CVSS 3.1 · NVD

6.1Medium

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: Low
Availability impact: None

CVSS 2.0 · NVD

4.3Medium

AV:N/AC:M/Au:N/C:N/I:P/A:N

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
6.1	MEDIUM	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:N/I:P/A:N

CISA required action

⚡ Known exploited · remediation due Jun 14, 2022

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Details

CVE ID: CVE-2018-19953
Status: Analyzed
Assigner (CNA): qnap
Published: Oct 28, 2020
Last modified: 2026-10-01 20:17 UTC
Weaknesses: CWE-79 · Cross-site Scripting (XSS)
CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:20 UTC.