CVE-2026-56147 Elastic CVE debrief

Who should care

Security teams and administrators responsible for Kibana instances should be aware of this vulnerability, as it allows low-privileged authenticated users to retrieve, modify, and delete case attachments they are not authorized to access. This vulnerability can impact the security and integrity of case attachments, potentially leading to unauthorized information disclosure and compromise.

Technical summary

The vulnerability is caused by an inconsistency in Kibana's file access authorization logic, which allows a low-privileged authenticated user to retrieve, modify, and delete case attachments that belong to feature areas they are not authorized to access. This is due to the access control check and resource retrieval using different resolution mechanisms. The vulnerability can be exploited by an authenticated attacker with limited file management permissions, potentially leading to unauthorized information disclosure and case attachment integrity compromise.

Defensive priority

High priority due to the potential for unauthorized information disclosure and case attachment integrity compromise.

Recommended defensive actions

• Review and update Kibana access controls to ensure proper authorization for file management.
• Monitor Kibana logs for suspicious file access and modification activities.
• Implement additional security measures, such as role-based access control and auditing.
• Verify the presence of Kibana instances in the environment and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, but further investigation is needed to determine the full scope of affected systems and potential impact. Affected systems likely include Kibana instances with specific configurations that allow low-privileged authenticated users to access case attachments they are not authorized to view or modify. Defenders should verify the presence of Kibana instances in their environment, review access controls, and monitor for suspicious activity. Evidence is limited to public sources and may not reflect the full scope of the vulnerability.

Official resources