CVE-2026-42401
Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
5.4
MEDIUM
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-42401
To remediate CVE-2026-42401, upgrade the affected package to a fixed version below.
- —upgrade to 8.19.16 or later
- —upgrade to 8.19.16 or later
Is CVE-2026-42401 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 8.0.0, < 8.19.16, >= 9.0.0, < 9.4.0
- >= 8.0.0, < 8.19.16, >= 9.0.0, < 9.4.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |