Arbitrary file upload in Cybertutor Newsiteserver (Nss)
CVE-2026-19852
NewSiteServer (NSS) developed by CyberTutor has an Arbitrary File Upload vulnerability. Unauthenticated remote attackers can upload arbitrary files, including malicious HTML files, thereby achieving effects similar to cross-site scripting.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.twcert.org.tw/tw/cp-132-11116-2c1d8-1.html (third-party-advisory)
- www.twcert.org.tw/en/cp-139-11120-64c52-2.html (third-party-advisory)
Frequently asked questions
- What is CVE-2026-19852?
- CVE-2026-19852 is a medium-severity vulnerability in Cybertutor Newsiteserver (Nss), classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 6.1/10. Published 2026-08-24.
- How severe is CVE-2026-19852?
- Medium severity. CVSS v3 base score is 6.1 out of 10.