The Document Library and the Adaptive Media modules in Liferay Portal 7.4.0 through 7.4.3.111, and older unsupported versions, and Liferay DXP 2023.Q4.0 through 2023.Q4.10, 2023.Q3.1 through 2023.Q3.10, 7.4 GA through update 92, and older unsupported versions uses an incorrect cache-control header, which allows local users to obtain access to downloaded files via the browsers cache.
The web application does not use an appropriate caching policy that specifies the extent to which each web page and associated form fields should be cached.