Medium severity · published Sep 1, 2026
CVE-2026-78603
Missing Authorization in Kibana Leading to Unauthorized Disclosure of Fleet Deployment Metadata
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KI
Kibana · Elastic
9.0.0 through 9.4.5; 9.5.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78603
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78603
Vendor Advisory
https://discuss.elastic.co/t/kibana-9-4-6-9-5-1-security-update-esa-2026-149/390069
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