CVE-2018-19942Network attack vector

Cross-site scripting through undisclosed File Station input

Published Apr 16, 2021 · Updated Sep 16, 2024

Cross-site scripting in File Station on affected QNAP NAS operating systems allows remote attackers to inject malicious code through web requests. QNAP has not disclosed the affected request parameter, endpoint, or input-neutralization error that permits script injection. Successful exploitation requires a user to interact with crafted content, and the resulting script runs in the File Station web security context.

CVSS severity6.1
Medium
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in File Station on affected QNAP NAS operating systems allows remote attackers to inject malicious code through web requests. QNAP has not disclosed the affected request parameter, endpoint, or input-neutralization error that permits script injection. Successful exploitation requires a user to interact with crafted content, and the resulting script runs in the File Station web security context.

The record

CVE
CVE-2018-19942
Published
Apr 16, 2021
Updated
Sep 16, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-80, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <h4.5.1.1472 build 20201031

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=unspecified <h4.5.1.1472 build 20201031
Linn Products Limited · QuTScloudversion=unspecified <c4.5.3.1454 build 20201013; version=unspecified <c4.5.4.1601 build 20210309
Linn Products Limited · QTSversion=unspecified <4.2.6 build 20210327; version=unspecified <4.3.3.1432 build 20201006; version=unspecified <4.3.4.1463 build 20201006; version=unspecified <4.3.6.1446 build 20200929; version=unspecified <4.5.1.1456 build 20201015; version=unspecified <4.5.2.1566 build 20210202

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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