Prototype pollution in Zabbix - CVE-2026-23929
Published: August 18, 2026
Vulnerability identifier: #VU144191
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23929
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script code in the victim's browser.
The vulnerability exists due to prototype pollution in searchParamsToObject() in the frontend Map page when processing URL parameters. A remote user can inject malicious HTML into the Zabbix UI to execute arbitrary script code in the victim's browser.
The issue results in stored cross-site scripting and requires user interaction.
Affected software
Zabbix
How to mitigate CVE-2026-23929
Install security update from vendor's website.
Zabbix - addressed in versions 6.0.46, 7.0.25, 7.4.9