CVE-2026-108121 Koozali - SME Server Improper Input Validation in domain Creation Leads to Denial of Service
High-privilege attackers can inject Apache directives during domain creation to corrupt configuration and cause a web server denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-108121?
CVE-2026-108121 is a medium-severity denial of service vulnerability in Koozali SME Server, published on 19 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Brian Mariani from DigitalCanion SA has discovered a vulnerability in the domain creation functionality of koozali's SME Server version 11.0rc1-215, allowing an attacker with high privileges to inject reserved Apache configuration directives, corrupting httpd.conf and preventing Apache from starting after a server reboot, resulting in a denial-of-service (DoS) condition affecting the web server and its hosted virtual hosts.
Which versions are affected by CVE-2026-108121?
How do I fix CVE-2026-108121?
No fix has been published for CVE-2026-108121 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-108121 being exploited?
There is no known exploitation of CVE-2026-108121 in the wild and no public exploit code.
Sources
Also known as GHSA-2pfr-4hx7-3p8p.