Vulnerability · Published Aug 13, 2026 · Assigned by elastic
CVE-2026-72657Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure
Medium 6.5
In plain English
A medium-severity authorization bypass via user-controlled key in Fleet Server from Elastic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Fleet Server | 8.3.0 – through 8.19.199.0.0 – through 9.4.49.5.0 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N