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CVE-2026-34391— Fleet Vulnerable to Windows MDM cross-device command disclosure

Quick assessment

Affected
fleetdm fleet
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.

Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.1之前版本存在安全漏洞，该漏洞源于Windows MDM命令处理不当，可能导致恶意设备访问其他设备的MDM命令，泄露敏感配置数据。

AI Predicted 8.6 Difficulty: Easy EPSS 0.26% · P16

Possible ATT&CK Techniques 2 AI

T1530 · Data from Cloud Storage T1530.001
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I. Basic Information for CVE-2026-34391

Vulnerability Information
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Vulnerability Title
Fleet Vulnerable to Windows MDM cross-device command disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is open source device management software. Prior to 4.81.1, a vulnerability in Fleet's Windows MDM command processing allows a malicious enrolled device to access MDM commands intended for other devices, potentially exposing sensitive configuration data such as WiFi credentials, VPN secrets, and certificate payloads across the entire Windows fleet. Version 4.81.1 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
对错误会话暴露数据元素
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.1之前版本存在安全漏洞，该漏洞源于Windows MDM命令处理不当，可能导致恶意设备访问其他设备的MDM命令，泄露敏感配置数据。
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
fleetdm fleet < 4.81.1 -

II. Public POCs for CVE-2026-34391

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III. Intelligence Information for CVE-2026-34391

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Vendor Advisories for CVE-2026-34391 (1)

Same Patch Batch · fleetdm · 2026-03-27 · 9 CVEs total

CVE-2026-26061 Fleet's unbounded request body read allows remote Denial of Service
CVE-2026-26060 Fleet: Password reset tokens remain valid after password change for 24 hours
CVE-2026-29180 Fleet's team maintainer can transfer hosts from any team via missing source team authoriza
CVE-2026-34386 Fleet vulnerable to SQL injection in MDM bootstrap package by authenticated team or globa
CVE-2026-34385 Fleet's Apple MDM profile delivery has second-order SQL injection that can compromise the
CVE-2026-34387 Fleet vulnerable to OS command injection via crafted software package metadata in uninstal
CVE-2026-34388 Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint
CVE-2026-34389 Fleet's user account creation via invite does not enforce invited email address

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-488

V. Comments for CVE-2026-34391

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