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Improper AuthorizationWeakness · CWE-285

CVE-2025-27509

CRITICAL · 9.3 CVSS v4.0 Published 2025-03-06
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-285

The application confirms who you are but does not properly check whether you are permitted to perform a given action, so authenticated users reach functions or data meant for others. Attackers test roles and object references to find the gap. Remediation is an authorization check on every request, evaluated against the acting user's actual permissions.

General guidance for the improper authorization class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Upgrade to Fleet 4.64.2 (or 4.63.2, 4.62.4, or 4.58.1 depending on your release channel)

  1. 1. Identify your current Fleet version using `fleetctl version` or checking the Fleet UI
  2. 2. If running an affected version (below 4.58.1, 4.62.4, 4.63.2, or 4.64.2), plan for upgrade to one of the fixed releases
  3. 3. Review Fleet upgrade documentation for your deployment method (Docker, Kubernetes, or direct binary)
  4. 4. Create a backup of your Fleet database before proceeding with upgrade
  5. 5. For Docker deployments: pull the new image tag (e.g., `fleetdm/fleet:v4.64.2`) and restart containers
  6. 6. For Kubernetes: update your deployment manifest with the new version and apply changes
  7. 7. For direct binary: download the new binary from Fleet releases, stop the service, replace binary, restart service
  8. 8. After upgrade, verify the Fleet UI is accessible and SAML authentication works correctly
Caveat No breaking changes mentioned in provided material; standard minor version upgrade process applies

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-27509 in production — separate from our analysis above.

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