CVE-2026-23921
Received Received - Intake
Blind SQL Injection in Zabbix API Enables Data Exfiltration

Publication date: 2026-03-24

Last updated on: 2026-03-24

Assigner: Zabbix

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.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-24
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23921
EUVD
EUVD-2026-14955
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
zabbix zabbix *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-89 The product 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. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.
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Executive Summary

This vulnerability is a blind SQL injection in Zabbix's API service, specifically in the file include/classes/api/CApiService.php. A low privilege user with API access can manipulate the sortfield parameter to execute arbitrary SQL select queries on the database.

Although the results of these queries are not returned directly, an attacker can use time-based techniques to extract sensitive data from the database.

Detection Guidance

I don't know

Mitigation Strategies

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Impact Analysis

The vulnerability can lead to the disclosure of sensitive information such as session identifiers.

This may allow an attacker to compromise administrator accounts, potentially gaining full control over the Zabbix system.

Compliance Impact

I don't know

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