Kibana Stored XSS via Unsanitized Index Data (CWE79)
CVE-2026-42401 Published on May 28, 2026
Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
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.
Vulnerability Analysis
CVE-2026-42401 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-42401 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-42401
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Affected Versions
Elastic Kibana:- Version 9.0.0, <= 9.3.4 is affected.
- Version 8.0.0, <= 8.19.15 is affected.