PT-2026-27475 · Zabbix+1 · Zabbix+1

Janis Nulle + 1 · Published 2026-03-24 · Updated 2026-04-17 · CVE-2026-23921

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Zabbix versions prior to 7.4.6

Description A Zabbix user with API access can exploit a blind SQL injection in the CApiService.php file. The issue resides in the sortfield parameter, allowing an attacker to execute arbitrary SQL selects. While query results are not directly returned, data can be exfiltrated using time-based techniques. This could lead to the disclosure of session identifiers and compromise of administrator accounts. The vulnerable component is located at the API endpoint include/classes/api/CApiService.php. The vulnerable parameter is sortfield.

Recommendations Update to Zabbix version 7.4.6 or later.

Fix

SQL injection

Weakness Enumeration

CWE-89

Related Identifiers

CVE-2026-23921

Affected Products

Red Os

Zabbix

References · 15

• https://cve.org/CVERecord?id=CVE-2026-23921 · Security Note
• https://ubuntu.com/security/CVE-2026-23921 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-23921 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23921 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23921 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23921 · Security Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-zabbix7-lts-cve-2026-23921-8.0 · Note
• https://twitter.com/the_yellow_fall/status/2037174508453585110 · Twitter Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/uyazvimost-zabbix7-4-cve-2026-23921-7.3 · Note
• https://twitter.com/autumn_good_35/status/2037537635619799449 · Twitter Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-zabbix7-2-cve-2026-23921-8.0 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/uyazvimost-zabbix7-2-cve-2026-23921-7.3 · Note
• https://support.zabbix.com/browse/ZBX-27640 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/uyazvimost-zabbix7-lts-cve-2026-23921-7.3 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-zabbix7-4-cve-2026-23921-8.0 · Note