CVE-2026-46616: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in umbraco Umbraco-CMS
Umbraco CMS versions prior to 13.14.0 and 17.4.0 contain an open redirect vulnerability in some Surface Controllers that handle member-related operations. These controllers fail to properly validate redirect URLs derived from user-controlled query parameters, allowing malicious redirection. This vulnerability has been addressed in versions 13.14.0 and 17.4.0.
AI Analysis
Technical Summary
CVE-2026-46616 is an open redirect vulnerability (CWE-601) in Umbraco CMS, an ASP.NET content management system. The issue arises because certain Surface Controllers used for member-related operations do not validate redirect URLs properly. Razor templates that use 'RedirectUrl' from user-controlled query parameters can be exploited to redirect users to untrusted sites. This vulnerability affects versions prior to 13.14.0 and 17.4.0 and has been fixed in those versions.
Potential Impact
Successful exploitation could allow attackers to redirect users to malicious websites, potentially facilitating phishing or other social engineering attacks. The vulnerability impacts confidentiality and integrity to a limited extent by enabling user redirection but does not affect availability. The CVSS score is 5.4 (medium severity).
Mitigation Recommendations
Upgrade Umbraco CMS to version 13.14.0 or later, or 17.4.0 or later, where the vulnerability has been patched. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix is included in these versions.
CVE-2026-46616: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in umbraco Umbraco-CMS
Description
Umbraco CMS versions prior to 13.14.0 and 17.4.0 contain an open redirect vulnerability in some Surface Controllers that handle member-related operations. These controllers fail to properly validate redirect URLs derived from user-controlled query parameters, allowing malicious redirection. This vulnerability has been addressed in versions 13.14.0 and 17.4.0.
CVSS v3.1
Score 5.4medium
Affected software
pkg:github/umbraco/Umbraco-CMSRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46616 is an open redirect vulnerability (CWE-601) in Umbraco CMS, an ASP.NET content management system. The issue arises because certain Surface Controllers used for member-related operations do not validate redirect URLs properly. Razor templates that use 'RedirectUrl' from user-controlled query parameters can be exploited to redirect users to untrusted sites. This vulnerability affects versions prior to 13.14.0 and 17.4.0 and has been fixed in those versions.
Potential Impact
Successful exploitation could allow attackers to redirect users to malicious websites, potentially facilitating phishing or other social engineering attacks. The vulnerability impacts confidentiality and integrity to a limited extent by enabling user redirection but does not affect availability. The CVSS score is 5.4 (medium severity).
Mitigation Recommendations
Upgrade Umbraco CMS to version 13.14.0 or later, or 17.4.0 or later, where the vulnerability has been patched. No other official remediation or temporary fixes are indicated. Patch status is confirmed by the vendor advisory stating the fix is included in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-15T19:34:14.012Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2998e3c9170919df3e8edb
Added to database: 06/10/2026, 17:03:31 UTC
Last enriched: 06/17/2026, 17:50:58 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 93
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