What is CVE-2026-46616?

CVE-2026-46616 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2026-06-10.

How severe is CVE-2026-46616?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Open Redirect in Umbraco Umbraco-Cms

CVE-2026-46616

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.

Vulnerability class: Open Redirect

Published 2026-06-10 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (7.5th percentile), scored 2026-11-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001

Affected products

Umbraco Umbraco-Cms — versions < 13.14.0, >= 17.3.0-rc, < 17.4.0
Umbraco Cms

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/umbraco/Umbraco-CMS/pull/22561 (Patch, Issue Tracking)
github.com/umbraco/Umbraco-CMS/pull/22565 (Patch, Issue Tracking)
github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-2qjj-h6wp-c7h7 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-46616?: CVE-2026-46616 is a medium-severity vulnerability in Umbraco Umbraco-Cms, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2026-06-10.
How severe is CVE-2026-46616?: Medium severity. CVSS v3 base score is 5.4 out of 10.