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Medium · 5.9 CVE-2026-49858 EUVD-2026-41129GHSA-pjhx-3c3w-9v23

API Platform Core: Cross-user attribute leak in JSON:API and HAL item normalizers due to missing isCacheKeySafe gate

Published Jul 1, 2026 · Updated Jul 2, 2026 · Assigned by GitHub_M

Description

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. #[ApiProperty(security: ...)] is evaluated per request to decide whether a property is exposed. The componentsCache arrays in ApiPlatform\JsonApi\Serializer\ItemNormalizer and ApiPlatform\Hal\Serializer\ItemNormalizer are keyed on $context['cache_key'], which is set unconditionally before delegating to the parent normalizer. The component structure (attributes, relationships, links) computed for one request can therefore be reused for a subsequent request whose user has a different set of accessible properties. A user with lower privileges may end up seeing the structure of properties that the security predicate would otherwise have hidden for them. This issue has been fixed in versions 4.1.29, 4.2.26, and 4.3.12.

Affected products

VendorProductAffectedFixed
api-platform core >= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8 —
api-platform api-platform/hal >= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8 —
api-platform api-platform/json-api >= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist api-platform/core >= 2.6.0, < 4.1.29 4.1.29 GHSA-pjhx-3c3w-9v23
Packagist api-platform/core >= 4.2.0, < 4.2.25 4.2.25 GHSA-pjhx-3c3w-9v23
Packagist api-platform/core >= 4.3.0, < 4.3.8 4.3.8 GHSA-pjhx-3c3w-9v23
Packagist api-platform/hal >= 4.0.0, < 4.1.29 4.1.29 GHSA-pjhx-3c3w-9v23
Packagist api-platform/hal >= 4.2.0, < 4.2.25 4.2.25 GHSA-pjhx-3c3w-9v23
Packagist api-platform/hal >= 4.3.0, < 4.3.8 4.3.8 GHSA-pjhx-3c3w-9v23
Packagist api-platform/json-api >= 4.0.0, < 4.1.29 4.1.29 GHSA-pjhx-3c3w-9v23
Packagist api-platform/json-api >= 4.2.0, < 4.2.25 4.2.25 GHSA-pjhx-3c3w-9v23
Packagist api-platform/json-api >= 4.3.0, < 4.3.8 4.3.8 GHSA-pjhx-3c3w-9v23

References