---
id: CVE-2025-49643
title: >-
  An authenticated Zabbix user (including Guest) is able to cause
  disproportionate CPU load on the webserver by sending specially crafted
  parameters to /imgstore.php, leading to potential denial of service.
summary: >-
  An authenticated Zabbix user (including Guest) is able to cause
  disproportionate CPU load on the webserver by sending specially crafted
  parameters to /imgstore.php, leading to potential denial of service.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-405
vendor: zabbix
product: frontend
affected:
  - 'frontend >= 6.0.0, < 6.0.42'
  - 'frontend >= 7.0.0, < 7.0.19'
  - 'frontend >= 7.2.0, < 7.2.13'
  - 'frontend >= 7.4.0, < 7.4.3'
patched:
  - frontend 7.4.3
published: '2025-12-01'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-49643'
references:
  - url: 'https://support.zabbix.com/browse/ZBX-27284'
    label: security@zabbix.com
tags:
  - nvd
epss: 0.0034
epssPercentile: 0.24708
ingestedAt: '2026-09-26T00:22:39.982Z'
---

## Overview

An authenticated Zabbix user (including Guest) is able to cause disproportionate CPU load on the webserver by sending specially crafted parameters to /imgstore.php, leading to potential denial of service.

## Affected

- `frontend >= 6.0.0, < 6.0.42`
- `frontend >= 7.0.0, < 7.0.19`
- `frontend >= 7.2.0, < 7.2.13`
- `frontend >= 7.4.0, < 7.4.3`

## Remediation

Upgrade past the affected range:

- `frontend 7.4.3`