What is CVE-2026-80233?

CVE-2026-80233 is a high-severity vulnerability in Cayin Technology Cms-Se, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2026-08-26.

How severe is CVE-2026-80233?

High severity. CVSS v3 base score is 7.2 out of 10.

Arbitrary file upload in Cayin Technology Cms-Se

CVE-2026-80233

CAYIN CMS-WS, CMS-SE, and SMP series products developed by CAYIN Technology have an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shells backdoors, thereby enabling arbitrary code execution on the server.

Vulnerability class: Unrestricted File Upload

Published 2026-08-26 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.0th percentile), scored 2026-10-11.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.twcert.org.tw/tw/cp-132-11129-4a040-1.html (third-party-advisory)
www.twcert.org.tw/en/cp-139-11135-189f7-2.html (third-party-advisory)

Frequently asked questions

What is CVE-2026-80233?: CVE-2026-80233 is a high-severity vulnerability in Cayin Technology Cms-Se, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2026-08-26.
How severe is CVE-2026-80233?: High severity. CVSS v3 base score is 7.2 out of 10.