CVE-2018-19943Actively exploitedAdded to KEV 2022-05-24Medium severity, CVSS 5.4Known ransomware campaign use

QNAP NAS File Station Cross-Site Scripting Vulnerability

QNAP, Network Attached Storage (NAS)

Description

A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.

CVSS severity

Medium (5.4/10)

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Sourced from NVD, reflects how severe this vulnerability is if exploited, not whether it has been. Every advisory on this page is already a CISA-confirmed active exploitation case regardless of its CVSS score.

EPSS, exploit probability

High

22.7%

estimated chance of real-world exploitation in the next 30 days, higher than 97.7% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-06-14

CWE-79 CWE-80

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