Applications that allow HTTP PATCH access to resources exposed by Spring Data REST in versions 3.6.0 - 3.5.5, 3.7.0 - 3.7.2, and older unsupported versions, if an attacker knows about the structure of the underlying domain model, they can craft HTTP requests that expose hidden entity attributes.
In Spring Data REST, HTTP resources implemented by custom controllers using a configured base API path and a controller type-level request mapping are additionally exposed under URIs that can potentially be exposed for unauthorized access depending on the Spring Security configuration.
Malicious PATCH requests submitted to servers using Spring Data REST backed HTTP resources can use specially crafted JSON data to run arbitrary Java code.