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CVE-2026-23923— Unauthenticated arbitrary PHP class instantiation

Quick assessment

Affected
Zabbix Zabbix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zabbix是Zabbix公司的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix存在安全漏洞，该漏洞源于validate操作可实例化任意PHP类，具体影响取决于环境配置。

AI Predicted 9.8 Difficulty: Easy EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-23923

Vulnerability Information
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Vulnerability Title
Unauthenticated arbitrary PHP class instantiation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zabbix是Zabbix公司的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix存在安全漏洞，该漏洞源于validate操作可实例化任意PHP类，具体影响取决于环境配置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zabbix Zabbix 7.4.0 ~ 7.4.6 -

II. Public POCs for CVE-2026-23923

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III. Intelligence Information for CVE-2026-23923

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Vendor Advisories for CVE-2026-23923 (1)

Same Patch Batch · Zabbix · 2026-03-24 · 5 CVEs total

CVE-2026-23919 Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server
CVE-2026-23924 Agent 2 Docker plugin arbitrary file read via Docker API injection
CVE-2026-23920 Host and event action script regex validation can be bypassed in certain situations, leadi
CVE-2026-23921 Blind, read-only SQL injection in Zabbix API via sortfield parameter

IV. Related Vulnerabilities

Same product: Zabbix
Same vendor: Zabbix
Same weakness: CWE-470

V. Comments for CVE-2026-23923

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