CVE-2026-23919
Received Received - Intake
Information Disclosure in Zabbix JavaScript Context Reuse

Publication date: 2026-03-24

Last updated on: 2026-03-24

Assigner: Zabbix

Description
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>.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-24
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-14
NVD
CVE-2026-23919
EUVD
EUVD-2026-14950
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
zabbix zabbix_server *
zabbix zabbix_proxy *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-488 The product does not sufficiently enforce boundaries between the states of different sessions, causing data to be provided to, or used by, the wrong session.
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Executive Summary

This vulnerability exists in Zabbix Server and Proxy where JavaScript (Duktape) contexts are reused for performance reasons. These contexts are used in script items, JavaScript reprocessing, and Webhooks.

Because of this reuse, a regular (non-super) Zabbix administrator can potentially leak data from hosts they do not have access to, leading to confidentiality loss.

A fix has been released that makes the built-in Zabbix JavaScript objects read-only to mitigate this issue, but the use of global JavaScript variables is still not recommended as their content could be leaked.

Impact Analysis

This vulnerability can lead to unauthorized data disclosure where a regular Zabbix administrator might access confidential information from hosts they are not authorized to view.

Such confidentiality loss can compromise sensitive information within your monitoring environment, potentially exposing critical data to unauthorized personnel.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, apply the fix released by Zabbix that makes the built-in Zabbix JavaScript objects read-only.

Additionally, avoid using global JavaScript variables in Zabbix scripts, as their content could be leaked due to the reuse of JavaScript contexts.

For more detailed information, refer to the Zabbix documentation on known issues related to preprocessing and global variables.

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