Bug 2450863 (CVE-2026-23923)

Summary: CVE-2026-23923 Zabbix: Zabbix: Limited availability impact via arbitrary PHP class instantiation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Zabbix. An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. This could lead to a limited impact on the availability of the system, depending on the environment setup.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2450949, 2450939, 2450944, 2450948    
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Description OSIDB Bzimport 2026-03-24 19:02:20 UTC
An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. The impact depends on environment setup but appears limited at this time.