# CVE-2026-46616: Umbraco.Cms: Open Redirect Vulnerability in Surface Controllers

> Attackers can redirect users to malicious sites via unvalidated URLs in Umbraco CMS Surface Controllers, potentially facilitating phishing attacks.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 10 Jun 2026
- **Updated:** 10 Jun 2026
- **Also known as:** GHSA-2qjj-h6wp-c7h7

## What is CVE-2026-46616?

CVE-2026-46616 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-46616?

4 open source packages ship an affected version, including Umbraco.Cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Umbraco.Cms` | NuGet | All versions | 13.14.0 |
| `Umbraco.Cms` | NuGet | All versions | 13.14.0 |
| `Umbraco.Cms` | NuGet | From 17.3.0-rc | 17.4.0 |
| `Umbraco.Cms` | NuGet | From 17.3.0-rc | 17.4.0 |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2026-46616?

Upgrade Umbraco.Cms to a fixed version for your release line: 13.14.0 or 17.4.0.

## Is CVE-2026-46616 being exploited?

There is no known exploitation of CVE-2026-46616 in the wild and no public exploit code.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46616 and fix it if it is affected.

What it is: CVE-2026-46616 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-46616 in the wild and no public exploit code.

Affected packages and fixed versions:
- Umbraco.Cms (NuGet): affected all versions; fixed in 13.14.0
- Umbraco.Cms (NuGet): affected all versions; fixed in 13.14.0
- Umbraco.Cms (NuGet): affected from 17.3.0-rc; fixed in 17.4.0
- Umbraco.Cms (NuGet): affected from 17.3.0-rc; fixed in 17.4.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-46616/ (Markdown: https://insights.sbomify.com/CVE-2026-46616/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46616
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46616
- OSV: https://osv.dev/vulnerability/CVE-2026-46616

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46616/
Summaries are generated and may contain mistakes; the official description above is the record.