CVE-2026-78581

Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Data Modification in Kibana

MEDIUM
4.2
CVSS Score
Published: August 25, 2026 at 01:08 PM UTC
Updated: September 2, 2026 at 02:22 PM UTC
1 product affected across 1 vendorKibana

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Severity
MEDIUM4.2
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess identifier.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.0.0 ≤ v ≤ 8.16.28.0.0 ≤ v < 8.16.38.17.0 ≤ v < 8.17.28.0.0
Affected range stops below 8.16.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.17.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.2MEDIUMelastic
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-639

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