Zabbix API blind SQLi via sortfield in CApiService.php
CVE-2026-23921 Published on March 24, 2026
Blind, read-only SQL injection in Zabbix API via sortfield parameter
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.
Weakness Type
What is a SQL Injection Vulnerability?
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.
CVE-2026-23921 has been classified to as a SQL Injection vulnerability or weakness.
Products Associated with CVE-2026-23921
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Affected Versions
Zabbix:- Version 7.0.0, <= 7.0.21 is affected.
- Version 7.2.0, <= 7.2.14 is affected.
- Version 7.4.0, <= 7.4.5 is affected.