CVE-2026-4129: Ni Systemlink

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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 versions prior to 2026 Q3.

Affected products

• Ni Systemlink: before 26.5.0 (fixed in 26.5.0)
• Ni Systemlink Server: before 26.5.0 (fixed in 26.5.0)

Published 2026-09-10. Last modified 2026-09-16.