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Kibana CVE-2026-78603

| EUVDEUVD-2026-69571 MEDIUM
Missing Authorization (CWE-862)
2026-09-01 elastic GHSA-68p4-ggq7-7vvg
Information Disclosure Elastic Kibana
4.3
CVSS 3.1 · Vendor: elastic
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Severity by source

Vendor (elastic) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Network-accessible web app requiring valid credentials (PR:L); only read-only Fleet metadata disclosed with no integrity or availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (elastic).

CVSS VectorVendor: elastic

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Metadata Corrected
Sep 01, 2026 - 20:40 vuln.today
tag: Authentication Bypass removed
Analysis Generated
Sep 01, 2026 - 19:55 vuln.today
CVE Published
Sep 01, 2026 - 19:20 cve.org
MEDIUM 4.3

DescriptionCVE.org

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.

AnalysisAI

Kibana's missing server-side authorization check (CWE-862) allows any authenticated user holding only minimal Elasticsearch privileges to bypass Kibana feature authorization and Space access controls, reading Fleet deployment metadata from the default Kibana space without having been granted that permission. The flaw is rooted in an absent authorization gate on Fleet API paths rather than a misconfiguration, meaning the control is simply not enforced rather than configured incorrectly. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The attacker must hold a valid Kibana account with at least minimal Elasticsearch privileges - confirmed by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.3 Medium rating with vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N is well-calibrated for this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Kibana to version 9.4.6 or 9.5.1 as directed by Elastic advisory ESA-2026-149 at https://discuss.elastic.co/t/kibana-9-4-6-9-5-1-security-update-esa-2026-149/390069. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-78603 vulnerability details – vuln.today
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