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CVE-2026-24899— Fleet Windows MDM Azure AD JWT Authentication Bypass

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 4.82.0之前版本存在安全漏洞，该漏洞源于Windows MDM注册流程接受来自任何Azure AD租户的身份验证令牌，未强制执行aud或iss声明，可能导致攻击者使用任何Microsoft签名的Azure AD访问令牌注册未授权设备并访问MDM管理API。

AI Predicted 9.8 Difficulty: Easy EPSS 0.38% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
fleetdm fleet < 4.82.0 affected
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I. Basic Information for CVE-2026-24899

Vulnerability Information
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Vulnerability Title
Fleet Windows MDM Azure AD JWT Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is open source device management software. Prior to version 4.82.0, a vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the `aud` (audience) or `iss` (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints. If Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access. Version 4.82.0 contains a patch. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
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 4.82.0之前版本存在安全漏洞，该漏洞源于Windows MDM注册流程接受来自任何Azure AD租户的身份验证令牌，未强制执行aud或iss声明，可能导致攻击者使用任何Microsoft签名的Azure AD访问令牌注册未授权设备并访问MDM管理API。
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 < 4.82.0 -

II. Public POCs for CVE-2026-24899

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III. Intelligence Information for CVE-2026-24899

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Vendor Advisories for CVE-2026-24899 (1)

Vendor Pages for CVE-2026-24899 (1)

Same Patch Batch · fleetdm · 2026-05-14 · 6 CVEs total

CVE-2026-26062 Fleet server may terminate unexpectedly when handling certain gRPC requests
CVE-2026-26191 Fleet vulnerable to OS command injection in software packages
CVE-2026-24000 Fleet has a rate limiting bypass via untrusted client IP headers
CVE-2026-46356 Fleet: IP spoofing allows bypassing API rate limiting
CVE-2026-23998 Fleet has a Windows MDM management endpoint authentication bypass

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-290

V. Comments for CVE-2026-24899

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