Arbitrary file upload in Hillstone Networks Operation And Maintenance Security Gateway

CVE-2026-1791

Unrestricted Upload of File with Dangerous Type vulnerability in Hillstone Networks Operation and Maintenance Security Gateway on Linux allows Upload a Web Shell to a Web Server.This issue affects Operation and Maintenance Security Gateway: V5.5ST00001B113.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (26.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-1791: held from 0.003 to 0.004.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-1791?
CVE-2026-1791 is a low-severity vulnerability in Hillstone Networks Operation And Maintenance Security Gateway, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 2.7/10. Published 2026-02-04.
How severe is CVE-2026-1791?
Low severity. CVSS v3 base score is 2.7 out of 10.