CVE-2026-4129 NI SystemLink - Broken Access Control

NI SystemLink and NI SystemLink Server <= 2026 Q3 contain an improper access control vulnerability caused by insufficient restrictions on host OS files and directories, letting authenticated users with limited privileges access restricted files.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, File System Read
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to the latest version beyond 2026 Q3.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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