A vulnerability was found in Umbraco CMS 7.12.3 (Content Management System) and classified as problematic. Affected by this issue is some unknown functionality of the component Content Header Name Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability (Persistent). Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Persistent cross-site scripting (XSS) vulnerability in Umbraco CMS 7.12.3 allows authenticated users to inject arbitrary web script via the Header Name of a content (Blog, Content Page, etc.). The vulnerability is exploited when updating or removing public access of a content.

The bug was discovered 11/16/2018. The weakness was published 11/27/2018 (Website). The advisory is shared for download at cspcert.ph. This vulnerability is handled as CVE-2018-17256 since 09/20/2018. The attack may be launched remotely. A simple authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability was handled as a non-public zero-day exploit for at least 11 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at 127224, 127222 and 127221.

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Type

• Content Management System

Vendor

• Umbraco

Name

• CMS

Version

• 7.12.3

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CPE 2.2info

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