CVE-2026-49858

API Platform Core is a system to create hypermedia-driven REST and GraphQL APIs. In versions from 2.6.0 prior to 4.1.29, 4.2.26, and 4.3.12, a missing isCacheKeySafe gate in the JSON:API and HAL item normalizers causes a cross-user attribute leak. ApiPropertysecurity: ... is evaluated per request...

GraphQL grant on a property might be cached with different objects

Original message: I found an issue with security grants on on properties in the GraphQL ItemNormalizer: If you use something like ApiPropertysecurity: 'isgranted"PROPERTYREAD", object, property' on a member of an entity, the grant gets cached and is only evaluated once, even if the object in...