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CVE-2026-46616 — Umbraco.Cms: Open Redirect Vulnerability in...

MEDIUM

Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

Published May 21, 2026Updated June 10, 2026Source: osv

Summary

### 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

Advisory Timeline

  • First published May 21, 2026 (144 days ago).
  • Last revised June 10, 2026 — 20 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Umbraco.Cms to 13.14.0 or later
dotnet add package Umbraco.Cms --version 13.14.0
NuGet
Update Umbraco.Cms to 17.4.0 or later
dotnet add package Umbraco.Cms --version 17.4.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Umbraco.Cms
nuget
10.0.0, 10.0.0-rc1, 10.0.0-rc2, 10.0.0-rc3 (+176 more)13.14.0
Umbraco.Cms
nuget
17.3.0, 17.3.0-rc, 17.3.0-rc2, 17.3.0-rc3 (+8 more)17.4.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

Frequently Asked Questions

What is CVE-2026-46616?
Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.4/10).
How do I check if my project is affected by CVE-2026-46616?
CVE-2026-46616 affects Umbraco.Cms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-46616 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.4

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-2qjj-h6wp-c7h7

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