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CVE-2026-23920— Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection

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，该漏洞源于多行模式下正则表达式验证不当，可能导致经过身份验证的用户绕过检查并注入shell命令。

AI Predicted 8.6 Difficulty: Moderate EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-23920

Vulnerability Information
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Vulnerability Title
Host and event action script regex validation can be bypassed in certain situations, leading to potential command injection
Source: CVE Program / CVE List V5
Vulnerability Description
Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
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，该漏洞源于多行模式下正则表达式验证不当，可能导致经过身份验证的用户绕过检查并注入shell命令。
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 7.0.0 ~ 7.0.21 -

II. Public POCs for CVE-2026-23920

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III. Intelligence Information for CVE-2026-23920

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Vendor Advisories for CVE-2026-23920 (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-2026-23923 Unauthenticated arbitrary PHP class instantiation
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-78

V. Comments for CVE-2026-23920

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