CVE-2026-23921— Blind, read-only SQL injection in Zabbix API via sortfield parameter
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-23921
| # | POC Description | Source Link | Shenlong Link |
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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
- CVE-2026-23928
Stored XSS vulnerability in the Item history/Plain text widg - CVE-2026-23927
Agent 2 Oracle plugin TNS connection string injection via th - CVE-2026-23926
Stored XSS vulnerability in Host navigator widget maintenanc - CVE-2026-23924
Agent 2 Docker plugin arbitrary file read via Docker API inj - CVE-2026-23923
Unauthenticated arbitrary PHP class instantiation
Same vendor: Zabbix
- CVE-2026-23928
Stored XSS vulnerability in the Item history/Plain text widg - CVE-2026-23927
Agent 2 Oracle plugin TNS connection string injection via th - CVE-2026-23926
Stored XSS vulnerability in Host navigator widget maintenanc - CVE-2026-23924
Agent 2 Docker plugin arbitrary file read via Docker API inj - CVE-2026-23923
Unauthenticated arbitrary PHP class instantiation
Same weakness: CWE-89
- CVE-2021-47941
WordPress Plugin Survey & Poll 1.5.7.3 SQL Injection via sss - CVE-2021-47930
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Opencart TMD Vendor System 3.x Blind SQL Injection via produ - CVE-2026-8231
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SQL injection in pdo_firebird via NUL bytes in quoted string
V. Comments for CVE-2026-23921
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