Actively exploited in the wild
QNAP NAS File Station Cross-Site Scripting Vulnerability
QNAP - Network Attached Storage (NAS) · Listed in the CISA KEV since 2022-05-24. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2018-19943
HighCVSS 8.0KEVExploitation Probability (EPSS)
Very high risk97th percentile - higher than 97% of all known CVEs
Summary
A cross-site scripting (XSS) vulnerability in QNAP QTS systems could allow remote attackers to inject malicious code. Fixed in specific QTS versions.
Risk Assessment
An attacker could exploit XSS to hijack user sessions, steal data, or spread malware within the QNAP environment.
Recommendation
Update QTS to the versions listed in the description or later to mitigate the vulnerability.
Original NVD description (English source)
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