CVE-2026-72643: Elastic Kibana

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Kibana Agent Builder determines whether a caller owns a private agent by comparing a stable user identifier when one is recorded, and falling back to a comparison of the username when it is not. A username is not unique across Elasticsearch authentication realms, so two distinct principals that share a username in different realms are treated as the same owner. This discloses the configuration and instructions of an agent the caller does not own, and allows that agent to be altered or removed.

Affected products

• Elastic Kibana: from 9.4.0, before 9.4.5 (fixed in 9.4.5); version 9.5.0 only

Published 2026-08-13. Last modified 2026-09-03.