If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code.

Published 6 y ago 2020-10-28 · modified 36 d ago 2026-10-01 · JSON

CVSS

6.1

v3.1 · CNA

CISA KEV

Yes

added 2022-05-24

EPSS

30.5%

percentile 98%

Public exploits

none known

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.

Known exploited (CISA KEV)

Added: 4 y ago 2022-05-24
Due date: 2022-06-14 (4 y ago)
Ransomware use: Known to be used in ransomware campaigns
Required action: Apply updates per vendor instructions.
Vendor / product: QNAP / Network Attached Storage (NAS)
CISA name: QNAP NAS File Station Cross-Site Scripting Vulnerability

CISA SSVC assessment

Exploitation: Active — exploited in the wild
Automatable: no
Technical impact: total
Assessed: 2 mo ago 2026-08-13

Exploit prediction (EPSS)

30.53% probability of exploitation in the next 30 days, higher than 98% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CISA ADP	3.1	6.1	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`
NVD	3.1	6.1	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`
CNA	3.1	6.1	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`
NVD	2.0	4.3	`AV:N/AC:M/Au:N/C:N/I:P/A:N`

Affected products

QNAP Systems Inc. QTS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

References

qnap.com /zh-tw/security-advisory/qsa-20-01 · x_refsource_MISC, x_transferred
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19953 · government-resource

Sources

CVE List: CVE-2018-19953
NVD: CVE-2018-19953

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary