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CVE-2026-23921— Blind, read-only SQL injection in Zabbix API via sortfield parameter

Quick assessment

Affected
Zabbix Zabbix
Exploitation
High exploitation probability; assess promptly
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sortfield参数存在SQL注入，可能导致低权限用户通过基于时间的技术泄露任意数据库数据。

AI Predicted 8.1 Difficulty: Easy EPSS 3.94% · P90
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I. Basic Information for CVE-2026-23921

Vulnerability Information
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Vulnerability Title
Blind, read-only SQL injection in Zabbix API via sortfield parameter
Source: CVE Program / CVE List V5
Vulnerability Description
A low privilege Zabbix user with API access can exploit a blind SQL injection vulnerability in include/classes/api/CApiService.php to execute arbitrary SQL selects via the sortfield parameter. Although query results are not returned directly, an attacker can exfiltrate arbitrary database data through time-based techniques, potentially leading to session identifier disclosure and administrator account compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL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sortfield参数存在SQL注入，可能导致低权限用户通过基于时间的技术泄露任意数据库数据。
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-2026-23921

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III. Intelligence Information for CVE-2026-23921

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Other References for CVE-2026-23921 (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-2026-23923 Unauthenticated arbitrary PHP class instantiation

IV. Related Vulnerabilities

Same product: Zabbix
Same vendor: Zabbix
Same weakness: CWE-89

V. Comments for CVE-2026-23921

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