CVE-2026-78606: Elastic Kibana

Medium severity, CVSS 4.2. EPSS: 0.2% chance of exploitation in the next 30 days.

Incorrect Authorization (CWE-863) in Kibana can lead to unauthorized disclosure, modification, and deletion of data via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Where two authenticated principals originating from different authentication realms share the same username value, one could read, modify, and delete the other's private Elastic AI Assistant Knowledge Base entries.

Affected products

• Elastic Kibana: from 8.19.11, before 8.19.21 (fixed in 8.19.21); from 9.3.0, before 9.4.6 (fixed in 9.4.6); from 9.5.0, before 9.5.2 (fixed in 9.5.2)

Published 2026-09-01. Last modified 2026-09-02.