# Fleet Server 8.19.20, 9.4.5, 9.5.1 Security Update (ESA-2026-112) **URL:** \ **Category:** Security Announcements\ **Created:** [August 13, 2026, 10:47am UTC](https://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509 "2026-08-13T10:47:33Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![ikakavas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ikakavas/32/34430_2.png) [@ikakavas](https://discuss.elastic.co/u/ikakavas)\ **Post date:** [August 13, 2026, 10:47am UTC](https://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509/1 "2026-08-13T10:47:33Z")
**Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure** 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 Versions:** > > - All versions from 8.3.0 up to and including 8.19.19 > - All versions from 9.0.0 up to and including 9.4.4 > - Version 9.5.0 > **Affected Configurations:** All configurations are affected **Solutions and Mitigations:** The issue is resolved in versions 8.19.20, 9.4.5 and 9.5.1. **For Users that Cannot Upgrade:** There are no workarounds for this vulnerability. **Indicators of Compromise (IOC)** No specific indicators of compromise have been identified for this vulnerability. **Severity:** CVSSv3.1: Medium ( 6.5 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N **CVE ID:** CVE-2026-72657 **Problem Type:** CWE-639 - Authorization Bypass Through User-Controlled Key **Impact:** CAPEC-77 - Manipulating User-Controlled Variables