Missing Authorization in Kibana Fleet Plugin Leading to Cross-Space Agent Data Disclosure
Missing Authorization in Kibana Leading to Information Disclosure / Missing Authorization (CWE-862) in the Kibana Fleet feature can lead to information disclosure via Privilege Abuse (CAPEC-122). An authenticated user holding read-level Fleet agent privileges in one Kibana space could enumerate agent metadata and access diagnostic content belonging to agents enrolled in other Kibana spaces.
Affected Versions:
- 9.x:
- All versions from 9.1.0 up to and including 9.4.5
- All versions from 9.5.0 up to and including 9.5.2
Versions in the 8.x release line are not affected by this vulnerability because Fleet space awareness was disabled by default, eliminating the required namespace boundary conditions.
Affected Configurations:
Kibana deployments with Fleet space awareness enabled and multiple Kibana spaces in use. Fleet space awareness is enabled by default in new installations of the affected 9.x versions; deployments that have never configured more than one Kibana space are not at risk.
Solutions and Mitigations:
The issue is resolved in Kibana versions 9.4.6 and 9.5.3.
For Users that Cannot Upgrade:
There are no workarounds for this vulnerability.
Indicators of Compromise (IOC)
No specific indicators of compromise have been identified for this vulnerability.
Elastic Cloud Serverless
Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.
Severity: CVSSv3.1: Medium ( 4.3 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVE ID: CVE-2026-78595
Problem Type: CWE-862 - Missing Authorization
Impact: CAPEC-122 - Privilege Abuse