What is CVE-2026-4129?

CVE-2026-4129 is a high-severity vulnerability in Ni Systemlink, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-09-10.

How severe is CVE-2026-4129?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Ni Systemlink

CVE-2026-4129

There is an improper access control vulnerability in NI SystemLink that may allow an authenticated user with limited privileges to access host operating system files and directories that should be restricted. This vulnerability affects NI SystemLink and NI SystemLink Server 2026 Q3 and prior versions.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Ni Systemlink
Ni Systemlink Server

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security@ni.com

Frequently asked questions

What is CVE-2026-4129?: CVE-2026-4129 is a high-severity vulnerability in Ni Systemlink, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-09-10.
How severe is CVE-2026-4129?: High severity. CVSS v3 base score is 8.1 out of 10.