Vulnerability · Published Aug 18, 2026 · Assigned by Zabbix
CVE-2026-23934Frontend DoS via the validate.api.exists action
Medium 5.1
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 46% of all known vulnerabilities).
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.6%top 53.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An authenticated user is able to cause disproportionate CPU load on the Frontend webserver by sending specifically crafted requests to the Frontend validate.api.exists action, leading to potential denial of service.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23934 |
| Debian:13 | zabbix | no fix listed | DEBIAN-CVE-2026-23934 |
| Ubuntu:26.04:LTS | zabbix | no fix listed | UBUNTU-CVE-2026-23934 |
| Ubuntu:26.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23934 |
Affected products (as reported)
Weakness: CWE-405 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N