CVE-2026-23930 PUBLISHED

Frontend DoS via the popup.testtriggerexpr action

Assigner: Zabbix
Reserved: 19.01.2026 Published: 18.08.2026 Updated: 18.08.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Zabbix
Product	Zabbix
Versions	Default: unknown affected from 6.0.0 to 6.0.46 (incl.) affected from 7.0.0 to 7.0.26 (incl.) affected from 7.4.0 to 7.4.10 (incl.)

Affected Configurations

An unauthenticated user sending crafted HTTP requests to Zabbix Frontend.

Solutions

Update the affected components to their respective fixed versions.

Credits

Zabbix wants to thank barume for submitting this report on the HackerOne bug bounty platform. reporter

References

https://support.zabbix.com/browse/ZBX-28069

Problem Types

CWE-405: Asymmetric Resource Consumption (Amplification) CWE

Impacts

CAPEC-490: Amplification