How severe is CVE-2026-42401?

CVE-2026-42401 has a CVSS 3.x base score of 4.1, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-42401 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42401?

CVE-2026-42401 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42401?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42401 have an EU (EUVD) identifier?

Yes. CVE-2026-42401 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33012.

When was CVE-2026-42401 published?

CVE-2026-42401 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-42401

CVE-2026-42401 is a medium-severity vulnerability in Elastic Kibana with a CVSS 3.x base score of 4.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.1)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33012
Weakness: CWE-79
Affected product: Elastic Kibana
Published: 2026-05-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-42401?: 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 severe is CVE-2026-42401?: CVE-2026-42401 has a CVSS 3.x base score of 4.1, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-42401 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42401?: CVE-2026-42401 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42401?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42401 have an EU (EUVD) identifier?: Yes. CVE-2026-42401 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33012.
When was CVE-2026-42401 published?: CVE-2026-42401 was published on 2026-05-28 and last updated on 2026-06-17.

References

https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-34/386552

Affected products (1)

cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*

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