Is CVE-2026-4129 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-4129?

CVE-2026-4129 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-4129

Description

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.