CVE-2026-42401

MEDIUM

Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 4.1

EPSS 0.0014

EPSS Percentile 3.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (3)

Elastic/Kibana 8.0.0 - 8.19.15

elastic/kibana 8.0.0 - 8.19.16

Elastic/Kibana 9.0.0 - 9.3.4

Published May 28, 2026

Tracked Since May 29, 2026