Vulnerability · Published Aug 18, 2026 · Assigned by Zabbix
CVE-2026-23930Frontend DoS via the popup.testtriggerexpr action
Medium 5.3
In plain English
A medium-severity security flaw in Zabbix from Zabbix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.6%top 49.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23930 |
| Debian:13 | zabbix | no fix listed | DEBIAN-CVE-2026-23930 |
| Debian:14 | zabbix | 1:7.0.27+dfsg-1 | DEBIAN-CVE-2026-23930 |
| Ubuntu:26.04:LTS | zabbix | no fix listed | UBUNTU-CVE-2026-23930 |
| Ubuntu:26.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23930 |
Affected products (as reported)
Weakness: CWE-405 · Vector: 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