Summaryinfo

A vulnerability was found in Zabbix up to 7.0.21/7.2.14/7.4.5. It has been declared as critical. This impacts an unknown function of the file include/classes/api/CApiService.php. Executing a manipulation of the argument sortfield can lead to sql injection. The identification of this vulnerability is CVE-2026-23921. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Zabbix up to 7.0.21/7.2.14/7.4.5. It has been declared as critical. This vulnerability affects some unknown processing of the file include/classes/api/CApiService.php. The manipulation of the argument sortfield with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at support.zabbix.com. This vulnerability was named CVE-2026-23921 since 01/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/29/2026). This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

By approaching the search of inurl:include/classes/api/CApiService.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14955). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Network Management Software

Name

• Zabbix

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12
• 7.0.13
• 7.0.14
• 7.0.15
• 7.0.16
• 7.0.17
• 7.0.18
• 7.0.19
• 7.0.20
• 7.0.21
• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.2.10
• 7.2.11
• 7.2.12
• 7.2.13
• 7.2.14
• 7.4.0
• 7.4.1
• 7.4.2
• 7.4.3
• 7.4.4
• 7.4.5

License

• open-source

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CPE 2.2info

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