CVE-2026-27449 Umbraco.Engage.Forms Allows Unauthorized Access to Multiple API Endpoints
Unauthenticated attackers can access sensitive data via exposed API endpoints by enumerating identifiers, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27449?
CVE-2026-27449 is a high-severity missing authorization vulnerability in Umbraco.Engage.Forms, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-27449?
4 open source packages ship an affected version, including Umbraco.Engage.Forms.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.Engage.Forms NuGet | From 16.0.0 | 16.2.1 |
Umbraco.Engage.Forms NuGet | From 16.0.0 | 16.2.1 |
Umbraco.Engage.Forms NuGet | From 17.0.0 | 17.1.1 |
Umbraco.Engage.Forms NuGet | From 17.0.0 | 17.1.1 |
How do I fix CVE-2026-27449?
Upgrade Umbraco.Engage.Forms to a fixed version for your release line: 16.2.1 or 17.1.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-27449 being exploited?
There is no known exploitation of CVE-2026-27449 in the wild and no public exploit code.
Sources
Also known as GHSA-86vq-ccwf-rm62.