Is CVE-2026-78603 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-78603?

CVE-2026-78603 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-78603

Description

Missing Authorization (CWE-862) in Kibana can lead to information disclosure via Exploiting Incorrectly Configured Access Control Security Levels (CAPEC-180). An authenticated user holding minimal Elasticsearch privileges could bypass Kibana feature authorization and space access controls, resulting in the unauthorized disclosure of Fleet deployment metadata from the default Kibana space.