CVE-2026-72657 PUBLISHED

Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure

Assigner: elastic
Reserved: 10.08.2026 Published: 13.08.2026 Updated: 13.08.2026

Authorization Bypass Through User-Controlled Key (CWE-639) in Fleet Server can lead to information disclosure via Manipulating User-Controlled Variables (CAPEC-77). The authorization decision for artifact downloads relied on a client-supplied value that was persisted without being validated against the server-side record of the requesting agent's assignment. An authenticated party in possession of a valid enrolled agent credential could therefore retrieve a policy the agent is not assigned to.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Elastic
Product	Fleet Server
Versions	Default: unaffected affected from 8.3.0 to 8.19.19 (incl.) affected from 9.0.0 to 9.4.4 (incl.) Version 9.5.0 is affected

References

https://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509

Problem Types

CWE-639 Authorization Bypass Through User-Controlled Key CWE

Impacts

CAPEC-77 Manipulating User-Controlled Variables