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TI-2025-20341 Aliases CVE-2025-27509GHSA-52jx-g6m5-h735

SAML authentication vulnerability due to improper SAML response validation

Priority MEDIUM 49CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-285.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00669 52nd percentileScored 2026-11-07
Fix Fixed fleet (fleetdm): 4.64.2, 4.63.2, 4.62.4 +1github.com/fleetdm/fleet/v4 (Go): 4.64.2, 4.63.2, 4.62.4 +2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fleetdmfleet4.64.0 to before 4.64.2; 4.63.0 to before 4.63.2; 4.62.0 to before 4.62.4; before 4.58.14.64.2, 4.63.2, 4.62.4, 4.58.1Patch availableCNA
—github.com/fleetdm/fleet/v4 (Go)4.64.0 to before 4.64.24.64.2Patch availableGHSA-52jx-g6m5-h735
—github.com/fleetdm/fleet/v4 (Go)4.63.0 to before 4.63.24.63.2Patch availableGHSA-52jx-g6m5-h735
—github.com/fleetdm/fleet/v4 (Go)4.62.0 to before 4.62.44.62.4Patch availableGHSA-52jx-g6m5-h735
—github.com/fleetdm/fleet/v4 (Go)4.54.0 to before 4.58.14.58.1Patch availableGHSA-52jx-g6m5-h735
—github.com/fleetdm/fleet/v4 (Go)before 4.53.24.53.2Patch availableGHSA-52jx-g6m5-h735
  • fleet Vendorfleetdm Affected 4.64.0 to before 4.64.2; 4.63.0 to before 4.63.2; 4.62.0 to before 4.62.4; before 4.58.1 Fixed in 4.64.2, 4.63.2, 4.62.4, 4.58.1 Patch available CNA
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected 4.64.0 to before 4.64.2 Fixed in 4.64.2 Patch available GHSA-52jx-g6m5-h735
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected 4.63.0 to before 4.63.2 Fixed in 4.63.2 Patch available GHSA-52jx-g6m5-h735
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected 4.62.0 to before 4.62.4 Fixed in 4.62.4 Patch available GHSA-52jx-g6m5-h735
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected 4.54.0 to before 4.58.1 Fixed in 4.58.1 Patch available GHSA-52jx-g6m5-h735
  • github.com/fleetdm/fleet/v4 (Go) Vendor— Affected before 4.53.2 Fixed in 4.53.2 Patch available GHSA-52jx-g6m5-h735

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*——fleetdm
  • cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:* Versions — — ·fleetdm

Remediation

  • Fix · CNA fleet (fleetdm) Fixed in 4.64.2, 4.63.2, 4.62.4, 4.58.1
  • Fix · GHSA-52jx-g6m5-h735 github.com/fleetdm/fleet/v4 (Go) Fixed in 4.64.2 Advisory →
  • Fix · GHSA-52jx-g6m5-h735 github.com/fleetdm/fleet/v4 (Go) Fixed in 4.63.2 Advisory →
  • Fix · GHSA-52jx-g6m5-h735 github.com/fleetdm/fleet/v4 (Go) Fixed in 4.62.4 Advisory →
  • Fix · GHSA-52jx-g6m5-h735 github.com/fleetdm/fleet/v4 (Go) Fixed in 4.58.1 Advisory →
  • Fix · GHSA-52jx-g6m5-h735 github.com/fleetdm/fleet/v4 (Go) Fixed in 4.53.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27509
  2. 2026-10-03 Alias added: GHSA-52jx-g6m5-h735

References

Advisory 1

Other 5

  • TI-2026-29868 Fleet: Cross-Team Policy Data Exposure via Global Policy Read Endpoint CVSS 3.1MEDIUM 4.3
  • TI-2026-65639 Fleet before 4.87.0 Authentication Bypass via Device Identifiers CVSS 4.0CRITICAL 9.3
  • TI-2026-18942 Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment CVSS 4.0CRITICAL 9.3
  • TI-2020-16097 SAML authentication vulnerability in Fleet CVSS 3.1CRITICAL 10.0
  • TI-2026-76130 Unbounded gzip decompression in Fleet enables denial of service CVSS 4.0HIGH 8.7
  • TI-2026-76129 Unbounded recursion in Fleet Apple MDM enrollment lets attackers crash server CVSS 4.0HIGH 8.7
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences