EUVD-2026-326523

fkie_cve-2026-46616

Umbraco is an ASP.NET CMS. Prior to versions 13.14.0 and 17.4.0, 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. This issue has been patched in versions 13.14.0 and 17.4.0.

GHSA-2qjj-h6wp-c7h7 — Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

Affected: NuGet: Umbraco.Cms

### 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 17.4.0 and 13.14.0.

### Workarounds If users cannot upgrade immediately, they can mitigate the issue in their own site by ensuring every Razor form that posts to `UmbLoginStatusController`, `UmbProfileController` or `UmbRegisterController` passes a concrete, trusted `RedirectUrl` into `Html.BeginUmbracoForm's` route values.

For example:

```cshtml @using (Html.BeginUmbracoForm<UmbLoginStatusController>( "HandleLogout", new { RedirectUrl = Model.Url() })) { <button type="submit">Log out</button> } ```

### Resources

https://github.com/umbraco/Umbraco-CMS/pull/22565 https://github.com/umbraco/Umbraco-CMS/pull/22561

Most recent entries from all

EUVD-2026-326523

fkie_cve-2026-46616

GHSA-2qjj-h6wp-c7h7 — Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers