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CVE-2026-72657— Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure

Quick assessment

Affected
Elastic Fleet Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Fleet Server是荷兰Elastic公司开源的一个集中管理代理服务器的服务组件。 Elastic Fleet Server 8.3.0至8.19.19版本、9.0.0至9.4.4版本和9.5.0版本存在授权问题漏洞，该漏洞源于通过用户控制的键绕过授权，下载授权决策依赖客户端提供的值且未与服务器端代理分配记录验证，可能导致信息泄露，允许已认证用户检索未分配的策略。

CVSS 6.5 · Medium EPSS 0.39% · P30

Affected Version Matrix 3

VendorProduct Version RangeStatus
Elastic Fleet Server 8.3.0≤ 8.19.19 affected
9.0.0≤ 9.4.4 affected
9.5.0 affected
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I. Basic Information for CVE-2026-72657

Vulnerability Information
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Vulnerability Title
Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Fleet Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Fleet Server是荷兰Elastic公司开源的一个集中管理代理服务器的服务组件。 Elastic Fleet Server 8.3.0至8.19.19版本、9.0.0至9.4.4版本和9.5.0版本存在授权问题漏洞，该漏洞源于通过用户控制的键绕过授权，下载授权决策依赖客户端提供的值且未与服务器端代理分配记录验证，可能导致信息泄露，允许已认证用户检索未分配的策略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Fleet Server 8.3.0 ~ 8.19.19 -

II. Public POCs for CVE-2026-72657

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III. Intelligence Information for CVE-2026-72657

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Vendor Advisories for CVE-2026-72657 (1)

Same Patch Batch · Elastic · 2026-08-13 · 48 CVEs total

CVE-2026-72642 8.8 HIGH Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference
CVE-2026-72665 8.1 HIGH Missing Authorization in Kibana Leading to Unauthorized Execution of Host Response Actions
CVE-2026-72670 7.7 HIGH Exposure of Sensitive Information to an Unauthorized Actor in Kibana Leading to Disclosure
CVE-2026-72672 7.7 HIGH Incorrect Authorization in Kibana Leading to Disclosure of Elastic Defend Endpoint Event D
CVE-2026-72669 7.6 HIGH Missing Authorization in Kibana Leading to Cross-User Information Disclosure and Data Tamp
CVE-2026-72677 7.3 HIGH Relative Path Traversal in Kibana Fleet Leading to Unauthorized Deletion of Users and Othe
CVE-2026-72658 7.3 HIGH Cross-Site Request Forgery in Kibana Leading to Privilege Escalation
CVE-2026-72629 7.1 HIGH Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Space Access t
CVE-2026-72630 7.1 HIGH Incorrect Authorization in Kibana Fleet Leading to Privilege Escalation
CVE-2026-72675 7.1 HIGH Missing Authorization in Kibana Machine Learning Leading to Cross-Space Information Disclo
CVE-2026-72632 7.1 HIGH Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearc
CVE-2026-72643 7.1 HIGH Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Pri
CVE-2026-72666 6.8 MEDIUM Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Query E
CVE-2026-72686 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-72674 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-72684 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of
CVE-2026-49089 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-72651 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-72661 6.5 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-72663 6.5 MEDIUM Inefficient Algorithmic Complexity in Kibana Leading to Denial of Service

Showing top 20 of 48 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Fleet Server
Same vendor: Elastic
Same weakness: CWE-639

V. Comments for CVE-2026-72657

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