CVE-2025-24011: Umbraco.Cms Umbraco Allows User Enumeration Feasible Vulnerability

MODERATE
Advisory Identifier: GHSA-hmg4-wwm5-p999
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CVSS 5.3
CWE-203 CWE-200
Published
Advisory Summary

CVE-2025-24011 is a MODERATE (CVSS 5.3) umbraco allows user enumeration feasible vulnerability (CWE-203: Observable Discrepancy) affecting Umbraco.Cms libraries in the NuGet ecosystem. The issue involves umbraco allows user enumeration feasible based on management api timing and response codes. Remediation is available by upgrading affected packages to version 14.3.2, 15.1.2.

CVE-2025-24011 at a Glance

CVE Identifier CVE-2025-24011
GHSA Identifier GHSA-hmg4-wwm5-p999
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-203: Observable Discrepancy
Affected Product Umbraco.Cms
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix CVE-2025-24011

To remediate this vulnerability, upgrade all affected Umbraco.Cms 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 fixed: 14.3.2 
Upgrade Umbraco.Cms to 14.3.2
Umbraco.Cms fixed: 15.1.2 
Upgrade Umbraco.Cms to 15.1.2
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

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-24011, inspect your project dependencies for Umbraco.Cms:

inspect dependencies for Umbraco.Cms

Analyze the terminal output to locate any version of Umbraco.Cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 14.3.2), 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-203: Observable Discrepancy, where the product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor. In Umbraco.Cms, 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 Based on an analysis of response codes and timing of Umbraco 14+ management API responses, it's possible to determine whether an account exists. ### Patches Patched in 14.3.2 and 15.1.2. ### Workarounds None available.

CVE-2025-24011 Affected Umbraco.Cms Versions

2 component(s)
Fixed Versions:
14.3.215.1.2
Product / Package Ecosystem Affected Versions Fixed Version
Umbraco.Cms
nuget/Umbraco.Cms
NuGet
≥ 14.0.0
< 14.3.2
14.3.2
Umbraco.Cms
nuget/Umbraco.Cms
NuGet
≥ 15.0.0
< 15.1.2
15.1.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hmg4-wwm5-p999
NVD — CVE-2025-24011 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-24011
Security Fix Commit FIX COMMIT
https://github.com/umbraco/Umbraco-CMS/commit/559c6c9f312df1d6eb1bde82c4b81c0896da6382
Security Fix Commit FIX COMMIT
https://github.com/umbraco/Umbraco-CMS/commit/839b6816f2ae3e5f54459a0f09dad6b17e2d1e07
Umbraco.Cms Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS

Frequently Asked Questions

What is CVE-2025-24011?
CVE-2025-24011 is a security vulnerability in Umbraco.Cms involving Umbraco Allows User Enumeration Feasible Based On Management API Timing and Response Codes under CWE-203: Observable Discrepancy.
Which Umbraco.Cms versions are affected?
Affected versions include releases prior to 14.3.2, 15.1.2 across affected packages: Umbraco.Cms.
What version fixes CVE-2025-24011?
Upgrading to 14.3.2, 15.1.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Umbraco.Cms affected?
Yes, Umbraco.Cms is affected in releases prior to 14.3.2, 15.1.2. Upgrade your dependency to 14.3.2, 15.1.2 or later.
What is the CVSS score of CVE-2025-24011?
CVE-2025-24011 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2025-24011?
CVE-2025-24011 is classified under CWE-203: Observable Discrepancy (The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.).
How can I check NuGet dependencies for CVE-2025-24011?
Run the dependency tree command: 'inspect dependencies for Umbraco.Cms'. 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-hmg4-wwm5-p999",
  "modified" : "2025-04-17T12:43:18Z",
  "published" : "2025-01-21T21:21:30Z",
  "aliases" : [ "CVE-2025-24011" ],
  "summary" : "Umbraco Allows User Enumeration Feasible Based On Management API Timing and Response Codes ",
  "details" : "### Impact\n\nBased on an analysis of response codes and timing of Umbraco 14+ management API responses, it's possible to determine whether an account exists.\n\n### Patches\n\nPatched in 14.3.2 and 15.1.2.\n\n### Workarounds\n\nNone available.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "14.0.0"
      }, {
        "fixed" : "14.3.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "15.0.0"
      }, {
        "fixed" : "15.1.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hmg4-wwm5-p999"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-24011"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/commit/559c6c9f312df1d6eb1bde82c4b81c0896da6382"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/commit/839b6816f2ae3e5f54459a0f09dad6b17e2d1e07"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco-CMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-203" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-01-21T21:21:30Z",
    "nvd_published_at" : "2025-01-21T16:15:14Z"
  }
}