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Kibana CVE-2026-78598

| EUVDEUVD-2026-70059 MEDIUM
Incorrect Authorization (CWE-863)
2026-09-02 elastic GHSA-x87p-86f2-9mg9
Information Disclosure Elastic Kibana
5.4
CVSS 3.1 · Vendor: elastic
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Severity by source

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

PR:L reflects mandatory ML job management authentication; C:L/I:L because only ML job saved objects are exposed or modified, not broader Kibana or Elasticsearch data.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
Low
Availability
None

Lifecycle Timeline

3
Metadata Corrected
Sep 02, 2026 - 16:40 vuln.today
tag: Authentication Bypass removed
Analysis Generated
Sep 02, 2026 - 15:41 vuln.today
CVE Published
Sep 02, 2026 - 14:43 cve.org
MEDIUM 5.4

DescriptionCVE.org

Incorrect Authorization (CWE-863) in the Kibana machine learning feature can lead to information disclosure via Exploiting Incorrectly Configured Access Control Security Levels (CAPEC-180). An authenticated user holding machine learning job management privileges within a single Kibana space could cause a job's saved object to become accessible across all spaces in the Kibana instance, without holding access rights to those additional spaces.

AnalysisAI

Incorrect Authorization (CWE-863) in Kibana's machine learning feature allows an authenticated low-privileged user to escalate their effective access beyond their assigned Kibana Space. A user holding ML job management privileges within a single Space can manipulate a job's saved object so it becomes accessible across all Spaces in the Kibana instance, bypassing the tenant-isolation boundary without holding rights to those additional Spaces. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Exploit
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Vulnerability AssessmentAI

Exploitation Exploitation requires: (1) a valid authenticated Kibana account - unauthenticated access is not possible (PR:L in CVSS vector confirms this); (2) the account must hold ML job management privileges within at least one Kibana Space; (3) the target Kibana instance must use the Spaces feature with multiple Spaces configured, and those Spaces must be intended to enforce access segregation between users. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 5.4 Medium rating is consistent with the realistic threat model. … 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 8.19.19, 9.3.8, or 9.4.4 per Elastic advisory ESA-2026-156 at https://discuss.elastic.co/t/kibana-8-19-19-9-3-8-9-4-4-security-update-esa-2026-156/390111. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-78598 vulnerability details – vuln.today
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