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CVE-2025-27509— SAML authentication vulnerability due to improper SAML response validation

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的一个开源的设备管理平台，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，免费且灵活。 Fleet 4.64.2之前版本存在授权问题漏洞，该漏洞源于攻击者可以伪造SAML响应以进行身份验证断言，可能导致创建新的管理员账户。

AI Predicted 8.6 Difficulty: Easy EPSS 0.67% · P51
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I. Basic Information for CVE-2025-27509

Vulnerability Information
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Vulnerability Title
SAML authentication vulnerability due to improper SAML response validation
Source: CVE Program / CVE List V5
Vulnerability Description
fleetdm/fleet is an open source device management, built on osquery. In vulnerable versions of Fleet, an attacker could craft a specially-formed SAML response to forge authentication assertions, provision a new administrative user account if Just-In-Time (JIT) provisioning is enabled, or create new accounts tied to forged assertions if f MDM enrollment is enabled. This vulnerability is fixed in 4.64.2, 4.63.2, 4.62.4, and 4.58.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是Fleet的一个开源的设备管理平台，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，免费且灵活。 Fleet 4.64.2之前版本存在授权问题漏洞，该漏洞源于攻击者可以伪造SAML响应以进行身份验证断言，可能导致创建新的管理员账户。
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 >= 4.64.0, < 4.64.2 -

II. Public POCs for CVE-2025-27509

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III. Intelligence Information for CVE-2025-27509

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Patches & Fixes for CVE-2025-27509 (1)

Vendor Advisories for CVE-2025-27509 (1)

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-285

V. Comments for CVE-2025-27509

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