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HIGH

CVE-2026-23921

CVSS v3

8.8

HIGH

EPSS Score

3.5 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-03-24
Last Modified
2026-09-10

Frequently asked questions

What is 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.

Is CVE-2026-23921 actively exploited?

Active exploitation of CVE-2026-23921 has not been confirmed. The EPSS score is 3.5%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23921?

CVE-2026-23921 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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