Open redirect in Umbraco CMS - CVE-2026-46616
Published: May 16, 2026 / Updated: May 16, 2026
Vulnerability identifier: #VU131594
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46616
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Umbraco
Affected software:
Umbraco CMS
Umbraco CMS
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect users to an arbitrary site.
The vulnerability exists due to improper input validation in Surface Controllers when handling member-related form submissions that use a user-controlled RedirectUrl query parameter. A remote attacker can supply a crafted redirect URL to redirect users to an arbitrary site.
User interaction is required to follow the malicious redirect.
How to mitigate CVE-2026-46616
Install security update from vendor's website.