CVE-2018-19953VulnerabilityPublished 05/24/2022Updated 10/24/2026

CVE-2018-19953: QNAP NAS File Station Cross-Site Scripting Vulnerability

Affects QNAP Network Attached Storage (NAS)Source CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 05/24/2022
KEV deadline: 06/14/2022
Ransomware: Used in ransomware campaigns
EPSS: 30.5% chance of exploitation in 30 days – higher than 98% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2018-19953 (opens in a new tab)

Description

CVE-2018-19953 is a cross-site scripting (XSS) vulnerability in QNAP NAS File Station that allows remote attackers to inject malicious code. This vulnerability has been exploited in the wild and is known to be used in ransomware campaigns. No specific affected versions or patch information is provided.

Summary

This vulnerability involves a cross-site scripting flaw in the QNAP NAS File Station component, enabling remote attackers to inject malicious scripts. The vulnerability is identified as CVE-2018-19953 and is associated with CWE-79 and CWE-80. Exploitation has been observed in real-world attacks, including ransomware campaigns targeting QNAP NAS devices.

Impact

Successful exploitation can lead to execution of malicious scripts in the context of the victim's browser, potentially resulting in session hijacking, credential theft, or further malware deployment. The vulnerability has been actively exploited in the wild and leveraged in ransomware campaigns, indicating a significant risk to affected QNAP NAS users.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should monitor QNAP's official channels for updates and apply any available patches promptly once released. Until a fix is available, limiting access to the File Station interface and employing network-level controls may reduce exposure.

CVE-2018-19953: QNAP NAS File Station Cross-Site Scripting Vulnerability

What to do

Description

Summary

Impact

Mitigation

Weaknesses

References

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:42:47 UTC

Weaknesses

References

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