Detections
Analytics

Zabbix 7.4.x < 7.4.7 Arbitrary PHP Class Instantiation (ZBX-27641)

medium Nessus Plugin ID 304681

Synopsis

A monitoring application installed on the remote host is affected by an arbitrary PHP class instantiation vulnerability.

Description

The version of Zabbix Server installed on the remote host is affected by a vulnerability. An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. The impact depends on environment setup but appears limited at this time.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Zabbix version 7.4.7 or later.

See Also

https://support.zabbix.com/browse/ZBX-27641

Plugin Details

Severity: Medium

ID: 304681

File Name: zabbix_ZBX-27641.nasl

Version: 1.2

Type: Local

Family: Misc.

Published: 4/2/2026

Updated: 4/3/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-23923

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v4

Risk Factor: Medium

Base Score: 6.9

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

Vulnerability Information

CPE: cpe:/a:zabbix:zabbix_server

Required KB Items: installed_sw/Zabbix Server

Patch Publication Date: 3/24/2026

Vulnerability Publication Date: 3/24/2026

Reference Information

CVE: CVE-2026-23923

IAVA: 2026-A-0279