CVE-2026-78591: Elastic Kibana

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22) in the Kibana Fleet feature can lead to the unauthorized deletion of resources via Path Traversal (CAPEC-126). A low-privileged user could cause a subsequent action taken by a higher-privileged user in the Fleet administration interface to act on an unintended target, resulting in the deletion of resources including accounts with elevated privileges.

Affected products

• Elastic Kibana: from 8.0.0, before 8.19.17 (fixed in 8.19.17); from 9.0.0, before 9.3.6 (fixed in 9.3.6); from 9.4.0, before 9.4.3 (fixed in 9.4.3)

Published 2026-09-02. Last modified 2026-09-03.