SQL Injection in Zabbix

CVE-2026-23921

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.

Vulnerability class: SQL Injection

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.035 (88.7th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-23921: rose from 0.029 to 0.035.

EPSS over last 30 days · oldest: 0.029 · newest: 0.035 · change: +0.006

Affected products

  • Zabbix — versions 7.0.0, 7.2.0, 7.4.0

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-23921?
CVE-2026-23921 is a high-severity vulnerability in Zabbix, classified under SQL Injection. CVSS score: 8.8/10. Published 2026-03-24.
How severe is CVE-2026-23921?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2026-23921 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.