What’s Vulnerable › Vulnerabilities
CVE-2026-23919: Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server
- Severity: medium (CVSS 6.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-24 · updated 2026-09-18
- Weakness: CWE-488
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>.
Affected products
- Zabbix: from 6.0.0 before 6.0.42; from 7.0.0 before 7.0.19; from 7.2.0 before 7.2.13; from 7.4.0 before 7.4.3 — fixed in 6.0.42, 7.0.19, 7.2.13, 7.4.3
How to fix
Upgrade to a fixed version: Zabbix 6.0.42, 7.0.19, 7.2.13, 7.4.3. Check the vendor advisory for mitigations.
References
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