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CVE-2026-23919

Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server

High7.1EPSS 0.26%
Published
Updated
Reserved
Assigned by
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>.

Scores

CVSS scores of CVE-2026-23919, by who scored it
Scored byCVSSScoreVector
ZabbixCNA (assigner)4.0High7.1CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
NVDNVD · Analyzed4.0High7.1CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.26% · top 83% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

Affected products

  • Zabbix · Zabbix

    • affected 6.0.0 – ≤ 6.0.41
    • affected 7.0.0 – ≤ 7.0.18
    • affected 7.2.0 – ≤ 7.2.12
    • affected 7.4.0 – ≤ 7.4.2

What to do

Solution: Update the affected components to their respective fixed versions. Make sure JavaScript item preprocessing scripts don't store secret data in global variables.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .