Incorrect Authorization in Kibana Leading to Machine Learning Audit Log Integrity Compromise
Incorrect Authorization (CWE-863) in Kibana can lead to integrity compromise of Machine Learning audit and notification records via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1).
A vulnerability exists in Kibana's Machine Learning functionality where a Machine Learning management endpoint performs an insufficient authorization check. The endpoint validates only a coarse privilege level but does not verify that the requesting user has access to the specific Machine Learning job or notification resources provided in the request. As a result, a low-privileged user with Machine Learning access in any Kibana space can manipulate Machine Learning audit and notification records for arbitrary jobs—including jobs in other spaces or belonging to other users—by leveraging Kibana's internally elevated credentials to write to restricted Machine Learning system indices that the user cannot access directly.
Affected Versions:
- 8.x: All versions from 8.0.0 up to and including 8.19.18
- 9.x:
- All versions from 9.0.0 up to and including 9.3.7
- All versions from 9.4.0 up to and including 9.4.3
Users on the 9.5.x release line are not affected. The first release of 9.5.0 already contains the fix for this vulnerability.
Note: This vulnerability was introduced in Kibana 7.14.0. Users on end-of-life versions prior to 8.0.0 that are running 7.14.0 or later are also affected and should upgrade to a fixed version.
Affected Configurations:
- All configurations with the Machine Learning feature enabled are affected. This feature is enabled by default in Kibana.
Solutions and Mitigations:
The issue is resolved in versions 8.19.19, 9.3.8, and 9.4.4.
For Users that Cannot Upgrade:
- There are no workarounds for this vulnerability.
Indicators of Compromise (IOC)
No specific indicators of compromise have been identified for this vulnerability.
Elastic Cloud Serverless
Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.
Severity: CVSSv3.1: Medium ( 4.3 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVE ID: CVE-2026-63145
Problem Type: CWE-863 - Incorrect Authorization
Impact: CAPEC-1 - Accessing Functionality Not Properly Constrained by ACLs