Umbraco Umbraco.Engage.Forms up to 16.2.0/17.1.0 API Endpoint ID access control

Summaryinfo

A vulnerability labeled as critical has been found in Umbraco Umbraco.Engage.Forms up to 16.2.0/17.1.0. This vulnerability affects unknown code of the component API Endpoint. The manipulation of the argument ID results in access control. This vulnerability is known as CVE-2026-27449. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Umbraco Umbraco.Engage.Forms up to 16.2.0/17.1.0. Affected is an unknown part of the component API Endpoint. The manipulation of the argument id with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality. CVE summarizes:

Umbraco Engage is a business intelligence platform. A vulnerability has been identified in Umbraco Engage prior to versions 16.2.1 and 17.1.1 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. 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. 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. No known workarounds are available.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-27449 since 02/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 16.2.1 or 17.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-8896). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Umbraco

Name

• Umbraco.Engage.Forms

Version

• 16.0
• 16.1
• 16.2.0
• 17.0
• 17.1.0

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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