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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>.

PUBLISHED Reserved 2026-01-19 | Published 2026-03-24 | Updated 2026-04-22 | Assigner Zabbix




HIGH: 7.1CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L

Problem types

CWE-488: Exposure of Data Element to Wrong Session

Product status

Default status
unknown

6.0.0 (git)
affected

7.0.0 (git)
affected

7.2.0 (git)
affected

7.4.0 (git)
affected

Credits

Zabbix wants to thank Yerdan (big_john) for submitting this report on the HackerOne bug bounty platform. reporter

References

support.zabbix.com/browse/ZBX-27638

cve.org (CVE-2026-23919)

nvd.nist.gov (CVE-2026-23919)

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