What’s Vulnerable › Vulnerabilities
CVE-2026-42401: Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-28 · updated 2026-10-14
- Weakness: CWE-79
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.
Affected products
- Kibana: from 8.0.0 before 8.19.16; from 9.0.0 before 9.3.5 — fixed in 8.19.16, 9.3.5
How to fix
Upgrade to a fixed version: Kibana 8.19.16, 9.3.5. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-42401 or the next vulnerability affects your stack