CVE-2026-27449
Published: 26 February 2026
Summary
CVE-2026-27449 is a high-severity Improper Access Control (CWE-284) vulnerability. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 21.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Device lock enforces restricted access until re-authentication, directly reducing unauthorized use of active sessions.
Explicitly identifying and documenting actions permitted without identification or authentication enforces proper access control boundaries by defining justified exceptions.
Requiring authorization and configuration controls for mobile device connections directly enforces access control and prevents unauthorized devices from reaching organizational systems.
Ensuring access control decisions are made and applied to every request before enforcement directly prevents improper access control by requiring policy-based checks.
Provides a tamperproof, always-invoked, and verifiable mechanism to enforce access control policies.
Enforcing approved authorizations directly implements access control policies to block unauthorized access.
Provides capability to review session content, directly detecting violations of access control.
Control assessments verify that access controls are implemented correctly and operating as intended, detecting improper access control before exploitation.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unauthenticated API exposure with IDOR (CWE-639/306/284) in public-facing Umbraco Engage web app directly enables T1190 exploitation for arbitrary sensitive data retrieval.
NVD 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…
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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.
Deeper analysisAI
CVE-2026-27449 is a vulnerability in Umbraco Engage, a business intelligence platform, affecting versions prior to 16.2.1 and 17.1.1. Certain API endpoints are exposed without authentication or authorization checks, allowing direct network access without a valid session or user credentials. By supplying a user-controlled identifier parameter, such as ?id=, attackers can retrieve sensitive data associated with arbitrary records. The lack of access control enables enumeration attacks, where identifiers can be iterated to extract data at scale. The issue is rated with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and is associated with CWE-284 (Improper Access Control), CWE-306 (Missing Authentication for Critical Function), and CWE-639 (Authorization Bypass Through User-Controlled Key).
An unauthenticated attacker with network access can exploit this vulnerability by directly querying the affected endpoints. They can achieve arbitrary record access using predictable or enumerable identifiers, leading to the disclosure of sensitive Engage-related data, such as analytics, tracking data, customer information, or other managed content. The confidentiality impact is high, with no identified effects on integrity or availability. Exploitation requires no privileges, user interaction, or special conditions beyond network reachability.
Patches have been released by Umbraco, and users are advised to update to version 16.2.1 or 17.1.1 to mitigate the issue. No workarounds are available. Additional details are provided in the GitHub security advisory at https://github.com/umbraco/Umbraco.Engage.Issues/security/advisories/GHSA-86vq-ccwf-rm62.
Details
- CWE(s)