Exposure of Sensitive Information to an Unauthorized Actor
Plone before 4.3.10rc1 and 5.0.x through 5.0.5rc1 and 5.1a1 allows remote attackers to obtain information about the ID of sensitive content via unspecified vectors.
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.