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TI-2026-21860 Aliases CVE-2026-27449GHSA-86vq-ccwf-rm62

Umbraco.Engage.Forms Allows Unauthorized Access to Multiple API Endpoints

Priority LOW 39CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00408 35th percentileScored 2026-11-07
Fix Fixed Umbraco.Engage.Forms (umbraco): 16.2.1, 17.1.1Umbraco.Engage.Forms (NuGet): 16.2.1, 17.1.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
umbracoUmbraco.Engage.Formsbefore 16.2.1; 17.0.0 to before 17.1.116.2.1, 17.1.1Patch availableCNA
—Umbraco.Engage.Forms (NuGet)16.0.0 to before 16.2.116.2.1Patch availableGHSA-86vq-ccwf-rm62
—Umbraco.Engage.Forms (NuGet)17.0.0 to before 17.1.117.1.1Patch availableGHSA-86vq-ccwf-rm62
  • Umbraco.Engage.Forms Vendorumbraco Affected before 16.2.1; 17.0.0 to before 17.1.1 Fixed in 16.2.1, 17.1.1 Patch available CNA
  • Umbraco.Engage.Forms (NuGet) Vendor— Affected 16.0.0 to before 16.2.1 Fixed in 16.2.1 Patch available GHSA-86vq-ccwf-rm62
  • Umbraco.Engage.Forms (NuGet) Vendor— Affected 17.0.0 to before 17.1.1 Fixed in 17.1.1 Patch available GHSA-86vq-ccwf-rm62

Remediation

  • Fix · CNA Umbraco.Engage.Forms (umbraco) Fixed in 16.2.1, 17.1.1
  • Fix · GHSA-86vq-ccwf-rm62 Umbraco.Engage.Forms (NuGet) Fixed in 16.2.1 Advisory →
  • Fix · GHSA-86vq-ccwf-rm62 Umbraco.Engage.Forms (NuGet) Fixed in 17.1.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27449
  2. 2026-10-03 Alias added: GHSA-86vq-ccwf-rm62
  3. 2026-10-24 Priority changed: LOW → MEDIUM
  4. 2026-10-25 Priority changed: MEDIUM → LOW

References

Advisory 1

Other 2

  • TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
  • TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
  • TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
  • TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
  • TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
  • TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
See all 75 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences