CVE-2026-42401

Improper Neutralization of Input During Web Page Generation (CWE-79) in Kibana can lead to stored HTML injection. A user with write access to an Elasticsearch index could persist crafted markup which, when subsequently rendered through an affected Kibana view by another user, was not sufficiently sanitized. Successful exploitation could result in unauthorized UI manipulation and outbound network requests issued from the viewing user's browser session.

CVSS v3 4.1 MEDIUM

4.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:elastic:kibana::::::::
	cpe:2.3:a:elastic:kibana::::::::

History

29 May 2026, 21:17

Type	Values Removed	Values Added
References	~~() https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552 -~~	() https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552 - Vendor Advisory
CPE		cpe:2.3:a:elastic:kibana::::::::
First Time		Elastic Elastic kibana

28 May 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-28 20:16

Updated : 2026-05-29 21:17

NVD link : CVE-2026-42401

Mitre link : CVE-2026-42401

CVE.ORG link : CVE-2026-42401

JSON object : View

Products Affected

elastic

kibana

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-42401", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security@elastic.co", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.3}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}]}, "published": "2026-05-28T20:16:23.620", "references": [{"url": "https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552", "tags": ["Vendor Advisory"], "source": "security@elastic.co"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@elastic.co", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "Improper Neutralization of Input During Web Page Generation (CWE-79) in Kibana can lead to stored HTML injection. A user with write access to an Elasticsearch index could persist crafted markup which, when subsequently rendered through an affected Kibana view by another user, was not sufficiently sanitized. Successful exploitation could result in unauthorized UI manipulation and outbound network requests issued from the viewing user's browser session."}], "lastModified": "2026-05-29T21:17:18.420", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "43EDC5B3-131D-489E-8447-05C5C599E6A7", "versionEndExcluding": "8.19.16", "versionStartIncluding": "8.0.0"}, {"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E9B40710-912A-4157-9F25-89CE26C098A9", "versionEndExcluding": "9.3.5", "versionStartIncluding": "9.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@elastic.co"}