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CVE-2026-46616

Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

5.4 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.18%Up 0.2 points since Jun 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.4

Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

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.

Record
CVE-2026-46616
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
EUVDEUVD-2026-36069 5.4

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.

Record
EUVD-2026-36069
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-2qjj-h6wp-c7h7 5.4

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 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:

  @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

Record
GHSA-2qjj-h6wp-c7h7
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
NVD 5.4

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.

Record
CVE-2026-46616
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
OSV 5.4

Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

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.

Record
CVE-2026-46616
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02
OSVGHSA-2qjj-h6wp-c7h7 5.4

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 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:

  @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

Record
GHSA-2qjj-h6wp-c7h7
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness
CWE-601
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
Umbraco.Cms
NuGet
 before 13.14.0
13.14.0
Umbraco.Cms
NuGet
 17.3.0-rc up to 17.4.0
17.4.0
Umbraco.Cms
NuGet
 before 13.14.0, plus listed versions
10.0.010.0.0-rc110.0.0-rc210.0.0-rc310.0.0-rc4
Show 45 moreShow less
10.0.0-rc510.0.110.1.010.1.0-rc10.1.0-rc210.1.110.2.010.2.0-rc10.2.110.3.010.3.0-rc10.3.110.3.210.4.010.4.0-rc10.4.110.4.210.5.010.5.0-rc10.5.110.6.010.6.0-rc10.6.110.7.010.7.0-rc10.8.010.8.0-rc10.8.110.8.1010.8.1110.8.210.8.310.8.410.8.510.8.610.8.710.8.810.8.911.0.011.0.0-rc111.0.0-rc211.0.0-rc311.0.0-rc411.0.0-rc511.0.0-rc6
13.14.0
Umbraco.Cms
NuGet
 17.3.0-rc up to 17.4.0, plus listed versions
17.3.017.3.0-rc217.3.0-rc317.3.117.3.2
Show 6 moreShow less
17.3.317.3.417.3.517.4.0-rc17.4.0-rc217.4.0-rc3
17.4.0

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-46616 is a medium vulnerability (CVSS 5.4) in Umbraco Cms, published May 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 7th percentile. Fixed in Umbraco.Cms 13.14.0.

References

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Left out here: 130 versions. The JSON record has them.

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