Umbraco <7.4.0- Server-Side Request Forgery

Umbraco before version 7.4.0 contains a server-side request forgery vulnerability in feedproxy.aspx that allows attackers to send arbitrary HTTP GET requests via http://local/Umbraco/feedproxy.aspx?url=http://127.0.0.1:80/index. id: CVE-2015-8813 info: name: Umbraco 7.4.0- Server-Side Request...

Cross-site Scripting (XSS)

Overview @umbraco-cms/backoffice is a This package contains the types for the Umbraco Backoffice. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the confirmation dialog element. An attacker can execute arbitrary scripts in the context of the affected application ...

Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog

Impact Authenticated users are able to inject HTML vulnerability into an input field, which is rendered in the confirmation dialog without proper output encoding. Patches This issue has been patched in 17.4.0...

GHSA-VR9V-27GG-QGX4 Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog

Impact Authenticated users are able to inject HTML vulnerability into an input field, which is rendered in the confirmation dialog without proper output encoding. Patches This issue has been patched in 17.4.0...

Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

Impact Some of the Surface Controllers in the CMS provide to support member related operations fail to validate redirect URLs, making Razor templates that derive 'RedirectUrl' from user-controlled query parameters vulnerable to malicious redirect attacks. Patches The issue is resolved in versions...

Open Redirect

Overview Affected versions of this package are vulnerable to Open Redirect via the RedirectUrl parameter in UmbLoginStatusController, UmbRegisterController, UmbProfileController controllers. An attacker can redirect users to arbitrary external sites by supplying a crafted URL in user-controlled...

GHSA-2QJJ-H6WP-C7H7 Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

Impact Some of the Surface Controllers in the CMS provide to support member related operations fail to validate redirect URLs, making Razor templates that derive 'RedirectUrl' from user-controlled query parameters vulnerable to malicious redirect attacks. Patches The issue is resolved in versions...

PT-2026-42585

Impact Some of the Surface Controllers in the CMS provide to support member related operations fail to validate redirect URLs, making Razor templates that derive 'RedirectUrl' from user-controlled query parameters vulnerable to malicious redirect attacks. Patches The issue is resolved in versions...

PT-2026-42705

🟠 Umbraco CMS, Open Redirect in Surface Controllers, CVE-2025-47874 Medium https://t.co/PmivsVMa8k...

PT-2026-42683

Name of the Vulnerable Software and Affected Versions Umbraco CMS versions prior to 17.4.0 Description Authenticated users can inject HTML into an input field. This content is then rendered in the confirmation dialog without proper output encoding, leading to Cross-Site Scripting XSS or HTML...

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-2026-31834

Umbraco is an ASP.NET CMS. From 15.3.1 to before 16.5.1 and 17.2.2, A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient...

GHSA-RHCG-3H8R-V6VP Umbraco Affected by Vertical Privilege Escalation via Missing Authorization Checks

Description A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group membership...

EUVD-2026-10937

Umbraco Affected by Vertical Privilege Escalation via Missing Authorization Checks...

Umbraco Affected by Vertical Privilege Escalation via Missing Authorization Checks

Description A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group membership...

Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering

Description 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 attributes such as onclick and onload, when used within...

EUVD-2026-10936

Umbraco has Stored XSS in UFM Rendering Pipeline via Permissive DOMPurify Attribute Filtering...

Authorization Bypass Through User-Controlled Key

Overview Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via a backpoffice API endpoint. An attacker can modify domain-related data on content nodes without proper authorization by making crafted API calls as an authenticated user, even when...

Cross-site Scripting (XSS)

Overview @umbraco-cms/backoffice is a This package contains the types for the Umbraco Backoffice. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the UFM rendering pipeline. An attacker can execute arbitrary scripts in the context of authenticated users by injecti...

Improper Privilege Management

Overview Affected versions of this package are vulnerable to Improper Privilege Management due to insufficient authorization enforcement when modifying user group memberships. An attacker can gain higher-level privileges by assigning highly privileged roles without proper validation of their own...