Deserialization of Untrusted Data in Zabbix - CVE-2026-23923
Published: March 25, 2026
Vulnerability identifier: #VU124619
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-23923
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Zabbix
Affected software:
Zabbix
Zabbix
Detailed vulnerability description
The vulnerability allows a remote attacker to instantiate arbitrary PHP classes.
The vulnerability exists due to improper input validation in the Frontend 'validate' action when handling requests. A remote attacker can send a specially crafted request to instantiate arbitrary PHP classes.
The impact depends on the environment setup but appears limited at this time.
How to mitigate CVE-2026-23923
Install security update from vendor's website.