CVE-2026-4129 Improper Access Controls in NI SystemLink
Authenticated users with limited privileges can access restricted host operating system files and directories in NI SystemLink Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4129?
CVE-2026-4129 is a high-severity missing authorization vulnerability in NI SystemLink, published on 10 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 versions prior to 2026 Q3.
Weakness: CWE-862
Which versions are affected by CVE-2026-4129?
How do I fix CVE-2026-4129?
No fix has been published for CVE-2026-4129 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4129 being exploited?
There is no known exploitation of CVE-2026-4129 in the wild and no public exploit code.
Sources
Also known as GHSA-f777-xf39-r6fm.