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

MODERATE
Advisory Identifier: GHSA-2qjj-h6wp-c7h7
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CVSS 5.4
CWE-601
Published
Advisory Summary

CVE-2026-46616 is a MODERATE (CVSS 5.4) open redirect vulnerability vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Umbraco.Cms libraries in the NuGet ecosystem. The issue involves open redirect vulnerability in surface controllers. Remediation is available by upgrading affected packages to version 13.14.0, 17.4.0.

CVE-2026-46616 at a Glance

CVE Identifier CVE-2026-46616
GHSA Identifier GHSA-2qjj-h6wp-c7h7
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Umbraco.Cms
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-46616

To remediate this vulnerability, upgrade all affected Umbraco.Cms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Umbraco.Cms fixed: 13.14.0 
Upgrade Umbraco.Cms to 13.14.0
Umbraco.Cms fixed: 17.4.0 
Upgrade Umbraco.Cms to 17.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Umbraco.Cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-46616, inspect your project dependencies for Umbraco.Cms:

inspect dependencies for Umbraco.Cms

Analyze the terminal output to locate any version of Umbraco.Cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 13.14.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Umbraco.Cms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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

CVE-2026-46616 Affected Umbraco.Cms Versions

2 component(s)
Fixed Versions:
13.14.017.4.0
Product / Package Ecosystem Affected Versions Fixed Version
Umbraco.Cms
nuget/Umbraco.Cms
NuGet
< 13.14.0
13.14.0
Umbraco.Cms
nuget/Umbraco.Cms
NuGet
≥ 17.3.0-rc
< 17.4.0
17.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-2qjj-h6wp-c7h7
NVD — CVE-2026-46616 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46616
Umbraco.Cms Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS/pull/22561
Umbraco.Cms Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS/pull/22565
Umbraco.Cms Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS

Frequently Asked Questions

What is CVE-2026-46616?
CVE-2026-46616 is a security vulnerability in Umbraco.Cms involving Open Redirect Vulnerability in Surface Controllers under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Umbraco.Cms versions are affected?
Affected versions include releases prior to 13.14.0, 17.4.0 across affected packages: Umbraco.Cms.
What version fixes CVE-2026-46616?
Upgrading to 13.14.0, 17.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Umbraco.Cms affected?
Yes, Umbraco.Cms is affected in releases prior to 13.14.0, 17.4.0. Upgrade your dependency to 13.14.0, 17.4.0 or later.
What is the CVSS score of CVE-2026-46616?
CVE-2026-46616 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-46616?
CVE-2026-46616 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check NuGet dependencies for CVE-2026-46616?
Run the dependency tree command: 'inspect dependencies for Umbraco.Cms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2qjj-h6wp-c7h7",
  "modified" : "2026-06-10T18:41:24Z",
  "published" : "2026-05-21T19:58:06Z",
  "aliases" : [ "CVE-2026-46616" ],
  "summary" : "Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers",
  "details" : "### Impact\nSome 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.\n\n### Patches\nThe issue is resolved in versions 17.4.0 and 13.14.0.\n\n### Workarounds\nIf 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. \n\nFor example:\n\n```cshtml\n  @using (Html.BeginUmbracoForm<UmbLoginStatusController>(\n      \"HandleLogout\",\n      new { RedirectUrl = Model.Url() }))\n  {\n      <button type=\"submit\">Log out</button>\n  }\n```\n\n### Resources\n\nhttps://github.com/umbraco/Umbraco-CMS/pull/22565\nhttps://github.com/umbraco/Umbraco-CMS/pull/22561",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "13.14.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.Cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "17.3.0-rc"
      }, {
        "fixed" : "17.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-2qjj-h6wp-c7h7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-46616"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/pull/22561"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/pull/22565"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco-CMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-21T19:58:06Z",
    "nvd_published_at" : "2026-06-10T17:16:37Z"
  }
}