CVE-2026-78606Network attack vectorHinoki check available

Data access and alteration via cross-realm identity collision

Published Sep 1, 2026 · Updated Sep 1, 2026

Incorrect authorization in affected Kibana releases allows remote authenticated users to read, modify, or delete private AI Assistant data. The Elastic AI Assistant Knowledge Base authorization path identifies owners by username without preserving the authentication realm, causing distinct principals with the same username to be treated as one owner. Exploitation requires principals in separate realms with the same username and roles granting AI Assistant access; single-realm deployments are unaffected.

CVSS severity4.2
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect authorization in affected Kibana releases allows remote authenticated users to read, modify, or delete private AI Assistant data. The Elastic AI Assistant Knowledge Base authorization path identifies owners by username without preserving the authentication realm, causing distinct principals with the same username to be treated as one owner. Exploitation requires principals in separate realms with the same username and roles granting AI Assistant access; single-realm deployments are unaffected.

The record

CVE
CVE-2026-78606
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Elastic
Product
Kibana
Classifications
CWE-863, CAPEC-1, T1565, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=8.19.11 <=8.19.20
  2. Affected versionversion=9.3.0 <=9.4.5
  3. Affected versionversion=9.5.0 <=9.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Kibanaversion=8.19.11 <=8.19.20; version=9.3.0 <=9.4.5; version=9.5.0 <=9.5.1

Published CVSS scores

4.2ElasticCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/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-863Incorrect Authorization
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1565Data Manipulation
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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