CVE-2025-27509Network attack vector

Administrative access via ambiguous SAML assertions

Published Mar 6, 2025 · Updated Mar 6, 2025

Improper authorization in Fleet allows remote attackers to gain administrative access through crafted SAML responses in SSO deployments. The server/sso validator searched for signed assertions by namespace but failed to require exactly one direct Assertion child in the correct namespace. SSO must be enabled; JIT provisioning permits creation of a new administrative account, while MDM enrollment permits accounts bound to forged assertions.

CVSS severity9.3
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Fleet allows remote attackers to gain administrative access through crafted SAML responses in SSO deployments. The server/sso validator searched for signed assertions by namespace but failed to require exactly one direct Assertion child in the correct namespace. SSO must be enabled; JIT provisioning permits creation of a new administrative account, while MDM enrollment permits accounts bound to forged assertions.

The record

CVE
CVE-2025-27509
Published
Mar 6, 2025
Updated
Mar 6, 2025
Vendor
Fleet Device Management
Product
Fleet
Classifications
CWE-285, T1606.002, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.58.1
  2. Affected versionversion=>= 4.62.0, < 4.62.4
  3. Affected versionversion=>= 4.63.0, < 4.63.2
  4. Affected versionversion=>= 4.64.0, < 4.64.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fleet Device Management · Fleetversion=< 4.58.1; version=>= 4.62.0, < 4.62.4; version=>= 4.63.0, < 4.63.2; version=>= 4.64.0, < 4.64.2

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1606.002SAML Tokens
T1136Create Account

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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