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CVE-2018-19943

QNAP NAS File Station Cross-Site Scripting Vulnerability

  • High 8.0
  • 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 these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later

Key facts

Published
28 Oct 2020
Last changed
13 Aug 2026
Assigned by
qnap
KEV added
24 May 2022
KEV fix due
14 Jun 2022
Used in ransomware
Yes, according to CISA
EPSS
22.682% likely to be exploited in the next 30 days, higher than 97.756% 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.

  • 8.0CVSS 3.1, Highfrom the CNA (qnap)CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

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 4.4.2.1270 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.4.1.1261 (affected)
  • unspecified up to but excluding 4.3.6.1263 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.3.4.1282 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.3.3.1252 (affected)
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.2.6 (affected)

Timeline

  1. 28 Oct 2020 Published
  2. 24 May 2022 CVE-2018-19943 added to CISA KEV
  3. 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