CVE-2026-42401
Medium
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.
SeverityMedium
CVSS4.1
Exploit probability—
Product
Elastic Kibana
PublishedMay 28, 2026
First seenMay 28, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- elastic kibana8.19.16, 9.3.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| elastic kibana | 8.0.0 ≤ v < 8.19.16, 9.0.0 ≤ v < 9.3.5 | 8.19.16, 9.3.5 |
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