CVE-2018-19953: in the CISA KEV catalogue
QNAP NAS File Station Cross-Site Scripting Vulnerability. CISA added CVE-2018-19953 to the Known Exploited Vulnerabilities catalogue on 2022-05-24 with a default due date of 2022-06-14. Known ransomware campaign use: Known. Forensic triage flag: No.
A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code. (CISA description)
- Vendor / product
- QNAP Network Attached Storage (NAS)
- CWE
- CWE-79, CWE-80
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 31%, percentile 98 (scored 2026-11-03)
EPSS puts about 31 in 100 odds (31%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 98% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2018-19953 in the CISA KEV catalogue?
Yes. CISA added CVE-2018-19953 (QNAP NAS File Station Cross-Site Scripting Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-05-24. CISA's default due date for it is 2022-06-14.
Is CVE-2018-19953 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2018-19953.
What should I do about CVE-2018-19953?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2018-19953