What is CVE-2026-26939?

CVE-2026-26939 is a medium-severity vulnerability in Elastic Kibana, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-03-19.

How severe is CVE-2026-26939?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Elastic Kibana

CVE-2026-26939

Missing Authorization (CWE-862) in Kibana’s server-side Detection Rule Management can lead to Unauthorized Endpoint Response Action Configuration (host isolation, process termination, and process suspension) via CAPEC-1 (Accessing Function…

Vulnerability class: Broken Access Control

EPSS: 0.000 (12.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Elastic Kibana — versions 9.0.0, 9.3.0, 8.0.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-19/385…

Frequently asked questions

What is CVE-2026-26939?: CVE-2026-26939 is a medium-severity vulnerability in Elastic Kibana, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-03-19.
How severe is CVE-2026-26939?: Medium severity. CVSS v3 base score is 6.5 out of 10.