CVE-2026-18808 Unauthenticated Remote Code Execution via Code Injection in Klemsan's KIO
Unauthenticated attackers can execute arbitrary code on Klemsan KIO servers, posing a critical risk to industrial control systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18808?
CVE-2026-18808 is a critical code injection vulnerability in KIO (Klemsan Internet Objects), published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Control of Generation of Code ('Code Injection') vulnerability in Klemsan Electrical Electronics Inc. KIO (Klemsan Internet Objects) allows Code Injection.
This issue affects KIO (Klemsan Internet Objects): before v1.9.
Weakness: CWE-94
Which versions are affected by CVE-2026-18808?
How do I fix CVE-2026-18808?
No fix has been published for CVE-2026-18808 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-18808 being exploited?
There is no known exploitation of CVE-2026-18808 in the wild and no public exploit code.
Sources
Also known as GHSA-25fc-9x7f-8x83.