---
id: CVE-2026-23938
title: >-
  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.
summary: >-
  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.
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-248
vendor: zabbix
product: zabbix
affected:
  - 'zabbix >= 6.0.0, < 6.0.47'
  - 'zabbix >= 7.0.0, < 7.0.27'
  - 'zabbix >= 7.4.0, < 7.4.11'
patched:
  - zabbix 7.4.11
published: '2026-08-18'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T15:41:10.513'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23938'
references:
  - url: 'https://support.zabbix.com/browse/ZBX-28075'
    label: security@zabbix.com
tags:
  - nvd
epss: 0.0031
epssPercentile: 0.21315
ingestedAt: '2026-09-23T16:27:22.630Z'
---

## Overview

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.

## Affected

- `zabbix >= 6.0.0, < 6.0.47`
- `zabbix >= 7.0.0, < 7.0.27`
- `zabbix >= 7.4.0, < 7.4.11`

## Remediation

Upgrade past the affected range:

- `zabbix 7.4.11`