CVE-2026-78581: CWE-639 Authorization Bypass Through User-Controlled Key in Elastic Kibana
Description
CVE-2026-78581 is an authorization bypass vulnerability in Elastic Kibana version 8.0.0. It allows an authenticated user to access or modify AI Assistant conversations belonging to other users by referencing another user's conversation identifier. Exploitation requires knowledge of a hard-to-guess identifier. The vulnerability has a medium severity with a CVSS score of 4.2.
CVSS v3.1
Score 4.2medium
Affected software
Elastic
Kibana
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-639) in Kibana 8.0.0 involves authorization bypass through a user-controlled key. An authenticated user can bypass access control lists (ACLs) to access or modify AI Assistant conversations of other users by referencing their conversation identifiers. The attack requires the attacker to know or guess a hard-to-guess conversation identifier. The issue is classified under CAPEC-1 (Accessing Functionality Not Properly Constrained by ACLs).
Potential Impact
An attacker with authenticated access can read or modify AI Assistant conversations of other users without proper authorization. This leads to unauthorized data modification and potential privacy breaches. The impact is limited to confidentiality and integrity with no availability impact.
Mitigation Recommendations
No official patch or fix is currently available for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, restrict access to Kibana to trusted users only and monitor for suspicious activity related to AI Assistant conversation access.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- elastic
- Date Reserved
- 2026-08-24T21:13:45.971Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8d9722acd9273b493979d7
Added to database: 08/25/2026, 13:22:42 UTC
Last enriched: 09/10/2026, 19:22:32 UTC
Last updated: 10/09/2026, 06:48:19 UTC
Views: 73
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