API Platform Core is a system to create hypermedia-driven REST and GraphQL APIs. From 3.2.0 until 3.2.4, exception messages, that are not HTTP exceptions, are visible in the JSON error response. This vulnerability is fixed in 3.2.5.
https://github.com/api-platform/core/security/advisories/GHSA-rfw5-cqjj-7v9r
https://github.com/api-platform/core/pull/5823
https://github.com/api-platform/core/commit/ba8a7e6538bccebf14c228e43a9339214c4d9201