CVE-2026-23921

HIGH

Blind, read-only SQL injection in Zabbix API via sortfield parameter

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-23921. PoCs published by RichJJ98.

AI-analyzed exploit summary This repository is a detailed technical analysis of SQL injection vulnerabilities in Zabbix, focusing on CVE-2026-23921. It includes root cause analysis, patch details, and a step-by-step breakdown of the attack chain from SQLi to RCE.

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.

Exploits (1)

nomisec WRITEUP
by RichJJ98 · poc
https://github.com/RichJJ98/analise-vulnerabilidades-zabbix-notebooklm

This repository is a detailed technical analysis of SQL injection vulnerabilities in Zabbix, focusing on CVE-2026-23921. It includes root cause analysis, patch details, and a step-by-step breakdown of the attack chain from SQLi to RCE.

Classification
Writeup 95%
Attack Type
Sqli
Complexity
Moderate
Reliability
Reliable
Target: Zabbix (multiple versions)
Auth required
Prerequisites: Access to Zabbix API with minimal privileges · Knowledge of SQL injection techniques
devstral-2 · analyzed Jun 10, 2026 Full analysis →

References (1)

Core 1

Scores

CVSS v4 8.7
EPSS 0.0024
EPSS Percentile 14.9%
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

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-89
Status published
Products (3)
Zabbix/Zabbix 7.0.0 - 7.0.21
Zabbix/Zabbix 7.2.0 - 7.2.14
Zabbix/Zabbix 7.4.0 - 7.4.5
Published Mar 24, 2026
Tracked Since Mar 25, 2026