CVE-2026-42401
Improper Neutralization of Input During Web Page Generation in Kibana Leading to Stored HTML Injection
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.
INFO
Published Date :
May 28, 2026, 8:16 p.m.
Last Modified :
May 29, 2026, 9:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 271b6943-45a9-4f3a-ab4e-976f3fa05b5a | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Kibana to the latest version.
- Ensure all user input is properly sanitized.
- Review Elasticsearch index write permissions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42401.
| URL | Resource |
|---|---|
| https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42401 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42401
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42401 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42401 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 29, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:* versions from (including) 8.0.0 up to (excluding) 8.19.16 *cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:* versions from (including) 9.0.0 up to (excluding) 9.3.5 Added Reference Type Elastic: https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552 Types: Vendor Advisory -
New CVE Received by [email protected]
May. 28, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N Added CWE CWE-79 Added Reference https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552