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OpenAdvisories
High · 8.7 Public exploit CVE-2026-23921 EUVD-2026-14955

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

Published Mar 24, 2026 · Updated Mar 26, 2026 · Assigned by Zabbix

Vendor: Zabbix Product: Zabbix Package: zabbix Package: zabbix Ecosystem: Debian Ecosystem: Ubuntu

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.

Affected products

VendorProductAffectedFixed
Zabbix Zabbix — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 zabbix 1:7.0.22+dfsg-1 —
Debian 13 zabbix 1:7.0.22+dfsg-1~deb13u1 —
Debian 12 zabbix No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 25.10 zabbix No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 22.04 LTS zabbix No fix yet —
Ubuntu Pro 20.04 LTS zabbix No fix yet —
Ubuntu Pro 18.04 LTS zabbix No fix yet —
Ubuntu Pro 16.04 LTS zabbix No fix yet —
Ubuntu Pro 14.04 LTS zabbix No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

  • qucklecrabik/CVE-2026-23921 ★ 6 · Sep 22, 2026

    This repository contains a proof-of-concept (PoC) exploit for CVE-2026-23921

  • RichJJ98/analise-vulnerabilidades-zabbix-notebooklm ★ 1 · Jun 9, 2026

    Caderno Temático NotebookLM: análise de vulnerabilidades SQL Injection (CVE-2024-42327, CVE-2026-23921) no Zabbix, com engenharia de prompts, cadeia de ataque até RCE e miniguia de hardening

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References