What is CVE-2026-78583?

CVE-2026-78583 is a high-severity vulnerability in Elastic Kibana, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-09-03.

How severe is CVE-2026-78583?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Elastic Kibana

CVE-2026-78583

Incorrect Authorization (CWE-863) in Kibana can lead to privilege escalation via Input Data Manipulation (CAPEC-153). Elasticsearch cluster privilege declarations originating from integration packages were not validated before being used to mint credentials for enrolled Elastic Agents. A user holding Fleet management privileges could therefore cause every Elastic Agent on a targeted policy to receive a credential carrying arbitrarily elevated Elasticsearch cluster privileges, up to and including full cluster administration.

Vulnerability class: Broken Access Control

Published 2026-09-03 · last modified 2026-09-08.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.1th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Elastic Kibana

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

discuss.elastic.co/t/kibana-8-19-21-9-4-6-9-5-3-security-update-esa-2026-140/39… (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78583?: CVE-2026-78583 is a high-severity vulnerability in Elastic Kibana, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-09-03.
How severe is CVE-2026-78583?: High severity. CVSS v3 base score is 8.1 out of 10.