CVE-2026-78581: Elastic Kibana

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

Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess identifier.

Affected products

• Elastic Kibana: from 8.0.0, before 8.16.3 (fixed in 8.16.3); from 8.17.0, before 8.17.2 (fixed in 8.17.2)

Published 2026-08-25. Last modified 2026-09-02.