CVE-2025-27509 - CVE House
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Status published Critical CVE-2025-27509

SAML authentication vulnerability due to improper SAML response validation

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2020-26276
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Affected Vendor

Affected Software

fleet
Vulnerable Versions:
>= 4.64.0, < 4.64.2, >= 4.63.0, < 4.63.2, >= 4.62.0, < 4.62.4, < 4.58.1

Timeline

Official Publish: March 6th, 2025
Last Modified: March 6th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-285

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1548 Abuse Elevation Control Mechanism
Privilege Escalation
T1021 Remote Services
Lateral Movement
T1098 Account Manipulation
Defense Evasion