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.

Category

9.3
CVSS
Severity: Critical
CVSS 4.0 •
EPSS 0.11%
Affected: fleetdm fleet
Published at:
Updated at:

References

Link Tags
https://github.com/fleetdm/fleet/security/advisories/GHSA-52jx-g6m5-h735
https://github.com/fleetdm/fleet/commit/718c95e47ad010ad6b8ceb3f3460e921fbfc53bb

Frequently Asked Questions

What is the severity of CVE-2025-27509?
CVE-2025-27509 has been scored as a critical severity vulnerability.
How to fix CVE-2025-27509?
To fix CVE-2025-27509, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27509 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27509 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27509?
CVE-2025-27509 affects fleetdm fleet.
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