What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-05-24
• EPSS: 30.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-28 · updated 2026-10-01
• Weakness: CWE-79

Description

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.

Affected products

• QNAP QTS: before 4.2.6; from 4.3.1.0013 before 4.3.3.1161; from 4.3.4 before 4.3.4.1190; from 4.3.6 before 4.3.6.1218; from 4.4.0 before 4.4.1.1201; from 4.4.2 before 4.4.2.1231 — fixed in 4.2.6, 4.3.3.1161, 4.3.4.1190, 4.3.6.1218, 4.4.1.1201, 4.4.2.1231

How to fix

Upgrade to a fixed version: QNAP QTS 4.2.6, 4.3.3.1161, 4.3.4.1190, 4.3.6.1218. Check the vendor advisory for mitigations.

References

• https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
• https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19953

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