CVE-2025-27509: SAML authentication vulnerability due to improper SAML response validation
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.
Classification
CVE ID: CVE-2025-27509
CVSS Base Severity: CRITICAL
CVSS Base Score: 9.3
CVSS Vector: 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
Problem Types
CWE-285: Improper AuthorizationAffected Products
Vendor: fleetdm
Product: fleet
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.09% (probability of being exploited)
EPSS Percentile: 23.98% (scored less or equal to compared to others)
EPSS Date: 2025-04-04 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: total
SSVC Automatable: true
References
https://nvd.nist.gov/vuln/detail/CVE-2025-27509https://github.com/fleetdm/fleet/security/advisories/GHSA-52jx-g6m5-h735
https://github.com/fleetdm/fleet/commit/718c95e47ad010ad6b8ceb3f3460e921fbfc53bb