Input validation error in Zabbix - CVE-2026-23930
Published: August 18, 2026
Vulnerability identifier: #VU144190
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23930
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the popup.testtriggerexpr action in the Frontend when handling crafted HTTP requests. A remote attacker can send specially crafted requests to cause a denial of service.
The issue can cause disproportionate CPU load on the Frontend webserver.
Affected software
Zabbix
How to mitigate CVE-2026-23930
Install security update from vendor's website.
Zabbix - addressed in versions 6.0.47, 7.0.27, 7.4.11