CVE-2025-27509
Fleet has SAML authentication vulnerability due to improper SAML response validation in github.com/fleetdm/fleet
Description
Fleet has SAML authentication vulnerability due to improper SAML response validation in github.com/fleetdm/fleet. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/fleetdm/fleet/v4 before v4.53.2, from v4.54.0 before v4.58.1, from v4.62.0 before v4.62.4, from v4.63.0 before v4.63.2, from v4.64.0 before v4.64.2.
How to fix CVE-2025-27509
To remediate CVE-2025-27509, upgrade the affected package to a fixed version below.
- —upgrade to 4.64.2 or later
- —no fix listed
Is CVE-2025-27509 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 4.64.0, < 4.64.2
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |