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CVE-2018-19953

QNAP NAS File Station Cross-Site Scripting Vulnerability

  • Medium 6.1
  • Exploited: added to CISA KEV 24 May 2022
  • Used in ransomware campaigns

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.

Key facts

Published
28 Oct 2020
Last changed
1 Oct 2026
Assigned by
qnap
KEV added
24 May 2022
KEV fix due
14 Jun 2022
Used in ransomware
Yes, according to CISA
EPSS
30.527% likely to be exploited in the next 30 days, higher than 98.266% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 6.1CVSS 3.1, Mediumfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.4.2.1231 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.4.1.1201 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.3.6.1218 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.3.4.1190 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.3.3.1161 (affected)
  • unspecified up to but excluding 4.2.6 (affected)

Timeline

  1. 28 Oct 2020 Published
  2. 24 May 2022 Added to the CISA KEV catalogue

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on XSS (stored, reflected, DOM) (CWE-79).

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References