{"id":"CVE-2026-23919","state":"PUBLISHED","title":"Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server","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>.","publishedAt":"2026-03-24T18:26:43.877Z","updatedAt":"2026-04-22T07:06:32.148Z","severity":{"score":7.1,"label":"High","version":"4.0","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","source":"Zabbix"},"assigner":"Zabbix","products":["Zabbix Zabbix"],"affected":[{"vendor":"Zabbix","product":"Zabbix","defaultStatus":"unknown","versions":[{"version":"6.0.0","status":"affected","lessThanOrEqual":"6.0.41","changes":[{"at":"6.0.42","status":"unaffected"}],"versionType":"git"},{"version":"7.0.0","status":"affected","lessThanOrEqual":"7.0.18","changes":[{"at":"7.0.19","status":"unaffected"}],"versionType":"git"},{"version":"7.2.0","status":"affected","lessThanOrEqual":"7.2.12","changes":[{"at":"7.2.13","status":"unaffected"}],"versionType":"git"},{"version":"7.4.0","status":"affected","lessThanOrEqual":"7.4.2","changes":[{"at":"7.4.3","status":"unaffected"}],"versionType":"git"}],"repo":"https://git.zabbix.com/","modules":["Server","Proxy"]}],"references":["https://support.zabbix.com/browse/ZBX-27638"],"weaknesses":["CWE-488"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23919.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23919","state":"PUBLISHED","datePublished":"2026-03-24T18:26:43.877Z","dateUpdated":"2026-04-22T07:06:32.148Z","assignerShortName":"Zabbix","assignerOrgId":"72de3e22-0555-4a0d-ae81-9249e0f0a1e8","dateReserved":"2026-01-19T14:02:54.327Z"},"containers":{"cna":{"title":"Insufficient isolation of JavaScript (Duktape) execution context on Zabbix Server","descriptions":[{"lang":"en","value":"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":[{"vendor":"Zabbix","product":"Zabbix","defaultStatus":"unknown","versions":[{"version":"6.0.0","status":"affected","lessThanOrEqual":"6.0.41","changes":[{"at":"6.0.42","status":"unaffected"}],"versionType":"git"},{"version":"7.0.0","status":"affected","lessThanOrEqual":"7.0.18","changes":[{"at":"7.0.19","status":"unaffected"}],"versionType":"git"},{"version":"7.2.0","status":"affected","lessThanOrEqual":"7.2.12","changes":[{"at":"7.2.13","status":"unaffected"}],"versionType":"git"},{"version":"7.4.0","status":"affected","lessThanOrEqual":"7.4.2","changes":[{"at":"7.4.3","status":"unaffected"}],"versionType":"git"}],"repo":"https://git.zabbix.com/","modules":["Server","Proxy"]}],"references":[{"url":"https://support.zabbix.com/browse/ZBX-27638"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"LOW","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.1,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-488","lang":"en","description":"CWE-488: Exposure of Data Element to Wrong Session","type":"CWE"}]}],"providerMetadata":{"shortName":"Zabbix","orgId":"72de3e22-0555-4a0d-ae81-9249e0f0a1e8","dateUpdated":"2026-04-22T07:06:32.148Z"},"impacts":[{"capecId":"CAPEC-124","descriptions":[{"lang":"en","value":"CAPEC-124: Shared Resource Manipulation"}]}],"configurations":[{"lang":"en","value":"A regular Zabbix administrator (non-super) can overwrite some built in JavaScript functions that are then executed for other objects. Alternatively, a regular Zabbix administrator can read global JavaScript variables.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>A regular Zabbix administrator (non-super) can overwrite some built in JavaScript functions that are then executed for other objects. Alternatively, a regular Zabbix administrator can read global JavaScript variables.</p>"}]}],"solutions":[{"lang":"en","value":"Update the affected components to their respective fixed versions. Make sure JavaScript item preprocessing scripts don't store secret data in global variables.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Update the affected components to their respective fixed versions. Make sure JavaScript item preprocessing scripts don't store secret data in global variables.</p>"}]}],"credits":[{"lang":"en","value":"Zabbix wants to thank Yerdan (big_john) for submitting this report on the HackerOne bug bounty platform.","type":"reporter"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-24T18:36:08.999862Z","id":"CVE-2026-23919","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-24T18:36:16.860Z"}}]}}}