QNAP NAS File Station Cross-Site Scripting Vulnerability

Are you affected?

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• cpe qnap/qtsversion unspecified
• cpe qnap/qts4.2.6
• vendor QNAP Network Attached Storage (NAS)version unspecified
• vendor QNAP QNAP Network-Attached Storage (NAS)version unspecified

How to fix CVE-2018-19953

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Jun 14, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 28, 2020 · Catalog

   Detected

   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.

2. May 24, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Jun 14, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Oct 1, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2018-19953

  A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.

  cisa.gov
• CVE.orgVulnerability recordCVE-2018-19953

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2018-19953

  30-day exploitation probability 29.0%

  first.org
• NIST NVDVulnerability recordCVE-2018-19953

  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

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2018-19953

  A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.

  vulncheck.com

References

• VulnCheck exploitation evidence · cybersecurityworks.com
• VulnCheck exploitation evidence · cybersecurityworks.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• Vendor Advisory · qnap.com

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.