In Liferay Portal 7.2.0 through 7.4.3.25, and older unsupported versions, and Liferay DXP 7.4 before update 26, 7.3 before update 5, 7.2 before fix pack 19, and older unsupported versions the default value of the portal property http.header.version.verbosity is set to full, which allows remote attackers to easily identify the version of the application that is running and the vulnerabilities that affect that version via Liferay-Portal` response header.
The product initializes or sets a resource with a default that is intended to be changed by the administrator, but the default is not secure.
Developers often choose default values that leave the product as open and easy to use as possible out-of-the-box, under the assumption that the administrator can (or should) change the default value. However, this ease-of-use comes at a cost when the default is insecure and the administrator does not change it.