CVE-2018-19953
QNAP NAS File Station Cross-Site Scripting Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 30.53% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 24 May 2022 · due 14 June 2022 · used in ransomware campaigns
- Weakness
- CWE-79, CWE-80
- Affected
- qnap/qts
- Source
- security@qnapsecurity.com.tw
EPSS moved from 28.8% on 24 September 2026 to 30.5% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2018-19953
References
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19953US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.