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CVE-2018-19953

Improper Neutralization of Input During Web Page Generation

CVSS 3.1 Medium 6.1Known exploited (CISA KEV)

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

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.

Official description from the CVE record, published by qnap. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 Medium 6.1

Score published by CISA-ADP in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: Required

    A user has to do something first, such as opening a file or following a link.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: Low

    Limited effect on the secrecy of data.

  • Integrity impact: Low

    Limited effect on the trustworthiness of data.

  • Availability impact: None

    No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.30527 (30.5% probability)
Percentile
98.3%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
QNAP NAS File Station Cross-Site Scripting Vulnerability
Added to the catalog
May 24, 2022
Federal due date
Jun 14, 2022
Ransomware campaigns
Known use

CISA assessment as of Aug 13, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-79Improper Neutralization of Input During Web Page Generation
  • CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page

Affected products

Products listed in the CVE record, as the CNA published them.

  • QNAP Systems Inc. QTS

    • affected: unspecified up to before 4.4.2.1231

  • QNAP Systems Inc. QTS

    • affected: unspecified up to before 4.4.1.1201

  • QNAP Systems Inc. QTS

    • affected: unspecified up to before 4.3.6.1218

  • QNAP Systems Inc. QTS

    • affected: unspecified up to before 4.3.4.1190

  • QNAP Systems Inc. QTS

    • affected: unspecified up to before 4.3.3.1161
    • affected: unspecified up to before 4.2.6

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:28 UTC. Sources and licenses