Umbraco CMS up to 10.8.110/13.9.1 Anonymously Authenticated Endpoint information expsure

Summaryinfo

A vulnerability marked as problematic has been reported in Umbraco CMS up to 10.8.110/13.9.1. The impacted element is an unknown function of the component Anonymously Authenticated Endpoint. The manipulation leads to information expsure. This vulnerability is listed as CVE-2025-49147. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Umbraco CMS up to 10.8.110/13.9.1. It has been rated as problematic. This issue affects an unknown code of the component Anonymously Authenticated Endpoint. The manipulation with an unknown input leads to a information expsure vulnerability. Using CWE to declare the problem leads to CWE-497. The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does. Impacted is confidentiality. The summary by CVE is:

Umbraco, a free and open source .NET content management system, has a vulnerability in versions 10.0.0 through 10.8.10 and 13.0.0 through 13.9.1. Via a request to an anonymously authenticated endpoint it's possible to retrieve information about the configured password requirements. The information available is limited but would perhaps give some additional detail useful for someone attempting to brute force derive a user's password. This information was not exposed in Umbraco 7 or 8, nor in 14 or higher versions. The vulnerability is patched in versions 10.8.11 and 13.9.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-49147 since 06/02/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 10.8.111 or 13.9.2 eliminates this vulnerability. Applying the patch b4144564c836ec6929111ce2a12eb1f67b42d61e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-19053). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Umbraco

Name

• CMS

Version

• 10.8.110
• 13.9.0
• 13.9.1

License

• open-source

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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