Vulnerabilities in pkg:nuget/Umbraco.Engage.Forms

PACKAGE
Advisory Identifier: GHSA-86vq-ccwf-rm62
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Advisory Summary

CVE-2026-27449 is a HIGH (CVSS 7.5) umbraco.engage.forms allows unauthorized access to vulnerability (CWE-284: Improper Access Control) affecting Umbraco.Engage.Forms libraries in the NuGet ecosystem. The issue involves umbraco.engage.forms allows unauthorized access to multiple api endpoints. Remediation is available by upgrading affected packages to version 16.2.1, 17.1.1.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:nuget/Umbraco.Engage.Forms

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:nuget/Umbraco.Engage.Forms. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-86vq-ccwf-rm62 CVE-2026-27449 HIGH Umbraco.Engage.Forms Allows Unauthorized Access to Multiple API Endpoints

CVE-2026-27449 at a Glance

CVE Identifier CVE-2026-27449
GHSA Identifier GHSA-86vq-ccwf-rm62
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-284: Improper Access Control
Affected Product Umbraco.Engage.Forms
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-27449

To remediate this vulnerability, upgrade all affected Umbraco.Engage.Forms 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.Engage.Forms fixed: 16.2.1 
Upgrade Umbraco.Engage.Forms to 16.2.1
Umbraco.Engage.Forms fixed: 17.1.1 
Upgrade Umbraco.Engage.Forms to 17.1.1
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.Engage.Forms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-27449, inspect your project dependencies for Umbraco.Engage.Forms:

inspect dependencies for Umbraco.Engage.Forms

Analyze the terminal output to locate any version of Umbraco.Engage.Forms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 16.2.1), 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-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Umbraco.Engage.Forms, 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

### Description A vulnerability has been identified in Umbraco Engage where certain API endpoints are exposed without enforcing authentication or authorization checks. The affected endpoints can be accessed directly over the network without requiring a valid session or user credentials. By supplying a user-controlled identifier parameter (e.g., ?id=), an attacker can retrieve sensitive data associated with arbitrary records. Because no access control validation is performed, the endpoints are vulnerable to enumeration attacks, allowing attackers to iterate over identifiers and extract data at scale. ### Impact An unauthenticated attacker can retrieve sensitive Engage-related data by directly querying the affected API endpoints. The vulnerability allows arbitrary record access through predictable or enumerable identifiers. The confidentiality impact is considered high. No direct integrity or availability impact has been identified. The scope of exposed data depends on the deployment but may include analytics data, tracking data, customer-related information, or other Engage-managed content. ### Patches The vulnerability affects both v16 and v17. Patches have already been released. Users are advised to update to 16.2.1 or 17.1.1 ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ ### References _Are there any links users can visit to find out more?_

CVE-2026-27449 Affected Umbraco.Engage.Forms Versions

2 component(s)
Fixed Versions:
16.2.117.1.1
Product / Package Ecosystem Affected Versions Fixed Version
Umbraco.Engage.Forms
nuget/Umbraco.Engage.Forms
NuGet
≥ 16.0.0
< 16.2.1
16.2.1
Umbraco.Engage.Forms
nuget/Umbraco.Engage.Forms
NuGet
≥ 17.0.0
< 17.1.1
17.1.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/umbraco/Umbraco.Engage.Issues/security/advisories/GHSA-86vq-ccwf-rm62
NVD — CVE-2026-27449 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27449
Umbraco.Engage.Forms Source Repository REPOSITORY
https://github.com/umbraco/Umbraco.Engage.Issues

Frequently Asked Questions

What is CVE-2026-27449?
CVE-2026-27449 is a security vulnerability in Umbraco.Engage.Forms involving Umbraco.Engage.Forms Allows Unauthorized Access to Multiple API Endpoints under CWE-284: Improper Access Control.
Which Umbraco.Engage.Forms versions are affected?
Affected versions include releases prior to 16.2.1, 17.1.1 across affected packages: Umbraco.Engage.Forms.
What version fixes CVE-2026-27449?
Upgrading to 16.2.1, 17.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Umbraco.Engage.Forms affected?
Yes, Umbraco.Engage.Forms is affected in releases prior to 16.2.1, 17.1.1. Upgrade your dependency to 16.2.1, 17.1.1 or later.
What is the CVSS score of CVE-2026-27449?
CVE-2026-27449 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-27449?
CVE-2026-27449 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check NuGet dependencies for CVE-2026-27449?
Run the dependency tree command: 'inspect dependencies for Umbraco.Engage.Forms'. 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-86vq-ccwf-rm62",
  "modified" : "2026-03-19T16:13:28Z",
  "published" : "2026-02-27T18:35:57Z",
  "aliases" : [ "CVE-2026-27449" ],
  "summary" : "Umbraco.Engage.Forms Allows Unauthorized Access to Multiple API Endpoints",
  "details" : "### Description\nA vulnerability has been identified in Umbraco Engage where certain API endpoints are exposed without enforcing authentication or authorization checks. The affected endpoints can be accessed directly over the network without requiring a valid session or user credentials. By supplying a user-controlled identifier parameter (e.g., ?id=), an attacker can retrieve sensitive data associated with arbitrary records.\n\nBecause no access control validation is performed, the endpoints are vulnerable to enumeration attacks, allowing attackers to iterate over identifiers and extract data at scale.\n\n### Impact\nAn unauthenticated attacker can retrieve sensitive Engage-related data by directly querying the affected API endpoints. The vulnerability allows arbitrary record access through predictable or enumerable identifiers.\n\nThe confidentiality impact is considered high. No direct integrity or availability impact has been identified.\n\nThe scope of exposed data depends on the deployment but may include analytics data, tracking data, customer-related information, or other Engage-managed content.\n\n### Patches\nThe vulnerability affects both v16 and v17. Patches have already been released. Users are advised to update to 16.2.1 or 17.1.1\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n### References\n_Are there any links users can visit to find out more?_",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Engage.Forms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "16.0.0"
      }, {
        "fixed" : "16.2.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Engage.Forms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.0.0"
      }, {
        "fixed" : "17.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco.Engage.Issues/security/advisories/GHSA-86vq-ccwf-rm62"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27449"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco.Engage.Issues"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284", "CWE-306", "CWE-639" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-27T18:35:57Z",
    "nvd_published_at" : "2026-02-26T22:20:47Z"
  }
}