by Kastro
Paper/Archive/CVE-2025-27509

CVE-2025-27509

fleetdm fleet — SAML authentication vulnerability due to improper SAML response validation

EPSS 0.7%CVSS 9.3
critical.is priorityof 100
38
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 52.0.520 × 2010.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
fleet>= 4.64.0, < 4.64.2–CNA
fleet>= 4.63.0, < 4.63.2–CNA
fleet>= 4.62.0, < 4.62.4–CNA
fleet< 4.58.1–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/fleetdm/fleet/security/advisories/GHSA-52jx-g6m5-h735refgithub.com/fleetdm/fleet/commit/718c95e47ad010ad6b8ceb3f3460e921fbfc53bb