#VU124617 Command injection in Zabbix - CVE-2026-23920
Published: March 25, 2026
Vulnerability identifier: #VU124617
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-23920
CWE-ID: CWE-77
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Zabbix
Zabbix
Software vendor:
Zabbix
Zabbix
Description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper input validation in host and event action script processing when handling regex validation in multiline mode. A remote user can send a specially crafted script input containing a newline character to bypass ^ and $ anchors in administrator-defined regex patterns and inject arbitrary shell commands.
Successful exploitation requires the attacker to have script execution permissions and the target system to use ^ and $ anchors in its input validation regex.
Remediation
Install security update from vendor's website.