CVE-2026-54164

Summary: API Platform Core versions prior to 4.1.30, 4.2.26 and 4.3.12 contain a type-confusion in the serializer’s AbstractItemNormalizer when resolving relation IRIs. An attacker able to submit write requests (POST/PUT/PATCH) to an API endpoint with writable relations can supply a relation IRI ...

CVE-2026-54164 API Platform Core: Missing IRI type check enables resource type confusion

API Platform Core is a system to create hypermedia-driven REST and GraphQL APIs. In versions prior to 4.1.30, 4.2.26 and 4.3.12, the serializer's AbstractItemNormalizer does not validate the resource type returned when resolving relation IRIs, allowing type confusion where a resource of an...