CVE-2026-42401 | THREATINT

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.

PUBLISHED Reserved 2026-04-27 | Published 2026-05-28 | Updated 2026-05-28 | Assigner elastic

MEDIUM: 4.1CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or ‘Cross-site Scripting’)

Product status

Default status
unaffected

9.0.0 (semver)
affected

8.0.0 (semver)
affected

References

discuss.elastic.co/…3-5-security-update-esa-2026-34/386552

cve.org (CVE-2026-42401)

nvd.nist.gov (CVE-2026-42401)

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