API Platform Core is a system to create hypermedia-driven REST and GraphQL APIs. Using the Relay special node type you can bypass the configured security on an operation. This vulnerability is fixed in 4.0.22 and 3.4.17.
https://github.com/api-platform/core/security/advisories/GHSA-cg3c-245w-728m
https://github.com/api-platform/core/releases/tag/v3.4.17
https://github.com/api-platform/core/commit/60747cc8c2fb855798c923b5537888f8d0969568
https://github.com/api-platform/core/commit/55712452b4f630978537bdb2a07dc958202336bb