Vulnerability · Published Mar 24, 2026 · Assigned by Zabbix
CVE-2026-23921Blind, read-only SQL injection in Zabbix API via sortfield parameter
High 8.7
In plain English
A high-severity SQL injection in Zabbix from Zabbix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.1% (higher than 91% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | zabbix | no fix listed | DEBIAN-CVE-2026-23921 |
| Debian:13 | zabbix | 1:7.0.22+dfsg-1~deb13u1 | DEBIAN-CVE-2026-23921 |
| Debian:14 | zabbix | 1:7.0.22+dfsg-1 | DEBIAN-CVE-2026-23921 |
| Ubuntu:25.10 | zabbix | no fix listed | UBUNTU-CVE-2026-23921 |
Affected products (as reported)
Weakness: CWE-89 · 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