CVE-2026-31833 Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration /.+/ in the UFM DOMPurify instance, event handler...

CVE-2026-31833 Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration /.+/ in the UFM DOMPurify instance, event handler...

CVE-2026-31833

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration /.+/ in the UFM DOMPurify instance, event handler...

CVE-2026-31833 Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration /.+/ in the UFM DOMPurify instance, event handler...

CVE-2026-31832 Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by...

CVE-2026-31832 Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by...

CVE-2026-31832

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by...

CVE-2026-31832

Umbraco (ASP.NET CMS) has a broken object-level authorization vulnerability in backoffice API endpoints affecting 14.0.0–before 16.5.1 and 17.2.2. An authenticated user can assign domain-related data to content nodes without proper authorization checks due to insufficient enforcement on the affec...

CVE-2026-31832 Umbraco Backoffice API Allows Unauthorized Modification of Domain Data

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by...

PT-2026-24485

Name of the Vulnerable Software and Affected Versions Umbraco versions 14.0.0 through 16.5.0 Umbraco version 17.2.2 Description Umbraco, an ASP.NET CMS, contains a flaw in a backoffice API endpoint related to object-level authorization. Authenticated users can assign domain-related data to conten...

PT-2026-24486

Name of the Vulnerable Software and Affected Versions Umbraco versions 16.2.0 through 16.5.0 Umbraco version 17.2.2 Description Umbraco is an ASP.NET CMS. An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. The issue stems from an...

PT-2026-24487

Name of the Vulnerable Software and Affected Versions Umbraco versions 15.3.1 through 16.5.0 Umbraco version 17.2.2 Description Umbraco CMS contains a privilege escalation issue. Authenticated backoffice users with user management permissions may be able to gain elevated privileges due to...

CVE-2026-31833: Improper Neutralization of Input During Web Page Generation

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration /.+/ in the UFM DOMPurify instance, event handler...

CVE-2026-31832: Authorization Bypass Through User-Controlled Key

Umbraco is an ASP.NET CMS. From 14.0.0 to before 16.5.1 and 17.2.2, A broken object-level authorization vulnerability exists in a backoffice API endpoint that allows authenticated users to assign domain-related data to content nodes without proper authorization checks. The issue is caused by...

Path Traversal

Umbraco Forms is vulnerable to Path Traversal. The vulnerability is due to insufficient validation of file paths, where an authenticated backoffice-user can enumerate and traverse paths/files on the system's filesystem and read their contents, particularly on Mac/Linux Umbraco installations using...

CVE-2026-24687

Umbraco Forms is a form builder that integrates with the Umbraco content management system. It's possible for an authenticated backoffice-user to enumerate and traverse paths/files on the systems filesystem and read their contents, on Mac/Linux Umbraco installations using Forms. As Umbraco Cloud...

EUVD-2026-4966

Umbraco.Forms has Path Traversal and File Enumeration Vulnerabilities in Linux/Mac...

Umbraco.Forms has Path Traversal and File Enumeration Vulnerabilities in Linux/Mac

Impact It's possible for an authenticated backoffice-user to enumerate and traverse paths/files on the systems filesystem and read their contents, on Mac/Linux Umbraco installations using Forms. As Umbraco Cloud runs in a Windows environment, Cloud users aren't affected. Patches This issue affect...

Directory Traversal

Overview Umbraco.Forms is an a form creator that's as easy to use. Affected versions of this package are vulnerable to Directory Traversal via the fileName parameter of the export endpoint. An attacker can access and read arbitrary files on the filesystem by submitting specially crafted requests...

CVE-2026-24687

Umbraco Forms is a form builder that integrates with the Umbraco content management system. It's possible for an authenticated backoffice-user to enumerate and traverse paths/files on the systems filesystem and read their contents, on Mac/Linux Umbraco installations using Forms. As Umbraco Cloud...