CVE-2026-23919 Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server
Insufficient isolation in Zabbix JavaScript contexts allows administrators to leak data from hosts they lack access to.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23919?
CVE-2026-23919 is a high-severity vulnerability in Zabbix Zabbix, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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>.
Weakness: CWE-488
Which versions are affected by CVE-2026-23919?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-23919?
Apply the vendor's patch.
Is CVE-2026-23919 being exploited?
There is no known exploitation of CVE-2026-23919 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-23919, GHSA-h55g-ww3m-9hq9, UBUNTU-CVE-2026-23919.