CVE-2026-23930 Frontend DoS via the popup.testtriggerexpr action
Unauthenticated attackers can cause denial of service on Zabbix Frontend by sending crafted requests to the popup.testtriggerexpr action.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23930?
CVE-2026-23930 is a medium-severity denial of service vulnerability in Zabbix Zabbix, published on 18 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An unauthenticated user is able to cause disproportionate CPU load on the Frontend webserver by sending specifically crafted requests to the Frontend popup.testtriggerexpr action, leading to potential denial of service.
Weakness: CWE-405
Which versions are affected by CVE-2026-23930?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-23930?
Apply the vendor's patch.
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-2026-23930 being exploited?
There is no known exploitation of CVE-2026-23930 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-23930, GHSA-88jj-c4p9-959j, UBUNTU-CVE-2026-23930.