Bug 2450874 (CVE-2026-23919)

Summary: CVE-2026-23919 Zabbix Server: Zabbix Proxy: Duktape: Zabbix Server and Proxy: Information disclosure via reused JavaScript contexts
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Zabbix Server and Proxy. This vulnerability arises from the system's reuse of JavaScript (Duktape) contexts, which are execution environments for JavaScript code. A regular Zabbix administrator, even without superuser privileges, can exploit this to access and leak sensitive data from hosts they are not authorized to manage. This leads to a confidentiality loss, as information intended to be restricted becomes accessible.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2450941, 2450932, 2450934, 2450937    
Bug Blocks:    

Description OSIDB Bzimport 2026-03-24 19:03:06 UTC
For performance reasons Zabbix Server/Proxy reuses JavaScript (Duktape) contexts (used in script items, JavaScript reprocessing, Webhooks). This can lead to confidentiality loss where a regular (non-super) Zabbix administrator leaks data for hosts they do not have access to. A fix has been released that makes the built in Zabbix JavaScript objects read-only, but please be advised that usage of global JavaScript variables is not recommended because their content could be leaked. More information <a href='https://www.zabbix.com/documentation/7.4/en/manual/installation/known_issues#preprocessing-global-variables-are-unsafe'>in Zabbix documentation</a>.