CVE-2026-78603Network attack vectorHinoki check available

Authenticated Fleet metadata disclosure via authorization bypass

Published Sep 1, 2026 · Updated Sep 1, 2026

Missing authorization in Elastic Kibana 9.0.0 through 9.4.5 and 9.5.0 allows remote authenticated users to read Fleet deployment metadata. Kibana fails to enforce feature authorization and default-space access controls when serving that metadata to minimally privileged Elasticsearch users. Exposure requires active native agentless connector infrastructure and Fleet policies in the default Kibana space.

CVSS severity4.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in Elastic Kibana 9.0.0 through 9.4.5 and 9.5.0 allows remote authenticated users to read Fleet deployment metadata. Kibana fails to enforce feature authorization and default-space access controls when serving that metadata to minimally privileged Elasticsearch users. Exposure requires active native agentless connector infrastructure and Fleet policies in the default Kibana space.

The record

CVE
CVE-2026-78603
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Elastic
Product
Kibana
Classifications
CWE-862, CAPEC-180, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <=9.4.5
  2. Affected versionversion=9.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Kibanaversion=9.0.0 <=9.4.5; version=9.5.0

Published CVSS scores

4.3ElasticCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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