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Fencer Intel
critical 9.3

CVE-2025-27509 json

SAML authentication vulnerability due to improper SAML response validation

published last yr. modified 4mo ago also EUVD-2025-7788 , GHSA-52jx-g6m5-h735 , GO-2025-3505

cvss
9.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

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.

Patch / fix

  • go github.com/fleetdm/fleet/v4 4.53.2, 4.58.1, 4.62.4, 4.63.2, 4.64.2
  • fleetdm fleet 4.58.1, 4.62.4, 4.63.2, 4.64.2
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250312T181707-1.1

opensuse advisories openSUSE-SU-2025:14889-1

Is CVE-2025-27509 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 9.3 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
CNA 4.0 9.3 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
go github.com/fleetdm/fleet/v4
>=4.64.0, <4.64.2
>=4.63.0, <4.63.2
>=4.62.0, <4.62.4
>=4.54.0, <4.58.1
<4.53.2
all versions
4.64.2
4.63.2
4.62.4
4.58.1
4.53.2

Affected products

  • fleetdm fleet

Classification

Weakness
  • CWE-285 Improper Authorization
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.