CVE-2025-27601: Umbraco.Cms.Api.Management Umbraco Allows Improper API Access Vulnerability

MODERATE
Advisory Identifier: GHSA-6ffg-mjg7-585x
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CVSS 4.3
CWE-285 CWE-863
Published
Advisory Summary

CVE-2025-27601 is a MODERATE (CVSS 4.3) umbraco allows improper api access vulnerability (CWE-285: Improper Authorization) affecting Umbraco.Cms.Api.Management libraries in the NuGet ecosystem. The issue involves umbraco allows improper api access control to low-privilege users to data type functionality. Remediation is available by upgrading affected packages to version 15.2.3, 14.3.3.

CVE-2025-27601 at a Glance

CVE Identifier CVE-2025-27601
GHSA Identifier GHSA-6ffg-mjg7-585x
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-285: Improper Authorization
Affected Product Umbraco.Cms.Api.Management
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2025-27601

To remediate this vulnerability, upgrade all affected Umbraco.Cms.Api.Management dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Umbraco.Cms.Api.Management fixed: 15.2.3 
Upgrade Umbraco.Cms.Api.Management to 15.2.3
Umbraco.Cms.Api.Management fixed: 14.3.3 
Upgrade Umbraco.Cms.Api.Management to 14.3.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Umbraco.Cms.Api.Management

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-27601, inspect your project dependencies for Umbraco.Cms.Api.Management:

inspect dependencies for Umbraco.Cms.Api.Management

Analyze the terminal output to locate any version of Umbraco.Cms.Api.Management in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 15.2.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In Umbraco.Cms.Api.Management, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact An improper API access control issue has been identified, allowing low-privilege, authenticated users to create and update data type information that should be restricted to users with access to the settings section. ### Patches Will be patched in 14.3.3 and 15.2.3. ### Workarounds None available.

CVE-2025-27601 Affected Umbraco.Cms.Api.Management Versions

2 component(s)
Fixed Versions:
15.2.314.3.3
Product / Package Ecosystem Affected Versions Fixed Version
Umbraco.Cms.Api.Management
nuget/Umbraco.Cms.Api.Management
NuGet
≥ 15.0.0-rc1
< 15.2.3
15.2.3
Umbraco.Cms.Api.Management
nuget/Umbraco.Cms.Api.Management
NuGet
< 14.3.3
14.3.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-6ffg-mjg7-585x
NVD — CVE-2025-27601 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27601
Security Fix Commit FIX COMMIT
https://github.com/umbraco/Umbraco-CMS/commit/d9fb6df16e9adf8656181cac8497fc5ba23321cd
Security Fix Commit FIX COMMIT
https://github.com/umbraco/Umbraco-CMS/commit/ebb6a580dc1da2c772a99838dc7b4660bf77eb9c
Umbraco.Cms.Api.Management Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS

Frequently Asked Questions

What is CVE-2025-27601?
CVE-2025-27601 is a security vulnerability in Umbraco.Cms.Api.Management involving Umbraco Allows Improper API Access Control to Low-Privilege Users to Data Type Functionality under CWE-285: Improper Authorization.
Which Umbraco.Cms.Api.Management versions are affected?
Affected versions include releases prior to 15.2.3, 14.3.3 across affected packages: Umbraco.Cms.Api.Management.
What version fixes CVE-2025-27601?
Upgrading to 15.2.3, 14.3.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Umbraco.Cms.Api.Management affected?
Yes, Umbraco.Cms.Api.Management is affected in releases prior to 15.2.3, 14.3.3. Upgrade your dependency to 15.2.3, 14.3.3 or later.
What is the CVSS score of CVE-2025-27601?
CVE-2025-27601 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2025-27601?
CVE-2025-27601 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check NuGet dependencies for CVE-2025-27601?
Run the dependency tree command: 'inspect dependencies for Umbraco.Cms.Api.Management'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6ffg-mjg7-585x",
  "modified" : "2025-03-12T14:40:21Z",
  "published" : "2025-03-11T15:27:28Z",
  "aliases" : [ "CVE-2025-27601" ],
  "summary" : "Umbraco Allows Improper API Access Control to Low-Privilege Users to Data Type Functionality",
  "details" : "### Impact\nAn improper API access control issue has been identified, allowing low-privilege, authenticated users to create and update data type information that should be restricted to users with access to the settings section.\n\n### Patches\nWill be patched in 14.3.3 and 15.2.3.\n\n### Workarounds\nNone available.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms.Api.Management"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "15.0.0-rc1"
      }, {
        "fixed" : "15.2.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 15.2.2"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms.Api.Management"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.3.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 14.3.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-6ffg-mjg7-585x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27601"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/commit/d9fb6df16e9adf8656181cac8497fc5ba23321cd"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/commit/ebb6a580dc1da2c772a99838dc7b4660bf77eb9c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco-CMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-11T15:27:28Z",
    "nvd_published_at" : "2025-03-11T16:15:17Z"
  }
}