CVE-2026-23938 PUBLISHED

Server DoS via JavaScript preprocessing or script items

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

An authenticated administrator is able to crash Zabbix server or proxy by creating specifically crafted preprocessing/script item JavaScript scripts, leading to potential denial of service.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 2.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	None
Privileges Required	High
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 attacker would need access to a regular (non-super) admin account.

Solutions

Update the affected components to their respective fixed versions.

Credits

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

References

https://support.zabbix.com/browse/ZBX-28075

Problem Types

CWE-248: Uncaught Exception CWE

Impacts

CAPEC-153: Input Data Manipulation