CVE-2026-40456 OS Command Injection in LMS
Attackers can execute arbitrary OS commands via an unvalidated IP address parameter in LMS, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40456?
CVE-2026-40456 is a high-severity command injection vulnerability in LMS, published on 18 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An OS Command Injection vulnerability exists in LMS (LAN Management System) before commit 9fcb4de due to an IP address parameter being passed to the "exec()" function without proper validation, allowing attackers to execute arbitrary operating system commands.
Weakness: CWE-78
Which versions are affected by CVE-2026-40456?
How do I fix CVE-2026-40456?
No fix has been published for CVE-2026-40456 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-40456 being exploited?
There is no known exploitation of CVE-2026-40456 in the wild and no public exploit code.
Sources
Also known as GHSA-765c-7qf8-cw9w.