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CVE-2026-42401— Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection

Quick assessment

Affected
Elastic Kibana
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Kibana是Elastic公司的一个可用数据可视化仪表板软件。 Elastic Kibana存在安全漏洞，该漏洞源于输入中和不当，可能导致具有Elasticsearch索引写入权限的用户持久化特制标记，当其他用户通过受影响的Kibana视图渲染时，可能导致未经授权的UI操作和出站网络请求。

CVSS 4.1 · Medium EPSS 0.24% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
Elastic Kibana 9.0.0≤ 9.3.4 affected
8.0.0≤ 8.19.15 affected
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I. Basic Information for CVE-2026-42401

Vulnerability Information
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Vulnerability Title
Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Kibana 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Kibana是Elastic公司的一个可用数据可视化仪表板软件。 Elastic Kibana存在安全漏洞，该漏洞源于输入中和不当，可能导致具有Elasticsearch索引写入权限的用户持久化特制标记，当其他用户通过受影响的Kibana视图渲染时，可能导致未经授权的UI操作和出站网络请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Kibana 9.0.0 ~ 9.3.4 -

II. Public POCs for CVE-2026-42401

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III. Intelligence Information for CVE-2026-42401

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Vendor Advisories for CVE-2026-42401 (1)

Same Patch Batch · Elastic · 2026-05-28 · 10 CVEs total

CVE-2026-42398 7.7 HIGH Server-Side Request Forgery (SSRF) in Kibana Leading to Unauthorized Network Access
CVE-2026-49095 7.2 HIGH Improper Input Validation in Kibana Fleet Leading to Privilege Escalation
CVE-2026-33464 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-42399 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-42400 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-49094 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-49093 6.3 MEDIUM Server-Side Request Forgery (SSRF) in Kibana Leading to Unauthorized Network Access
CVE-2026-33463 5.3 MEDIUM Operation on a Resource after Expiration or Termination in Kibana Leading to Unauthorized
CVE-2026-33462 4.6 MEDIUM Path Traversal in Kibana Leading to Unauthorized Deletion of User Accounts

IV. Related Vulnerabilities

Same product: Kibana
Same vendor: Elastic
Same weakness: CWE-79

V. Comments for CVE-2026-42401

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