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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Cms | < 13.14.0, >= 17.3.0-rc, < 17.4.0 | 13.14.0, 17.4.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-601- Platform
- .NET (NuGet)
- Package
Umbraco.Cms- Disclosed
- 21.05.2026
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2qjj-h6wp-c7h7 - CC BY 4.0
Vulnerability history: Umbraco.Cms
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 29
- First → latest
- 05.2022 09.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 17
- Low 7
Disclosures per year
- 2022: 2
- 2023: 8
- 2024: 5
- 2025: 8
- 2026: 6
-
Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers this entry
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