EUVD-2026-41126Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Network-accessible API write endpoint requires low-privilege authenticated access (PR:L); integrity is high from silent type-confused data corruption; no confidentiality or availability impact applies.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
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 unintended type can be silently assigned to a relation property. An attacker who can submit write requests (POST/PUT/PATCH) to an API Platform endpoint with writable relations can supply a relation IRI pointing to a resource of a different type than the relation's declared class. Because getResourceFromIri() does not pass an $operation to IriConverter::getResourceFromIri(), the is_a type guard at IriConverter.php:86 is skipped. For untyped relation properties (legacy @var-only style), the wrong-typed object is silently assigned, corrupting invariants and potentially feeding downstream logic that assumes the declared type (CWE-843). For typed properties (modern PHP 8.x), the substitution is blocked by Symfony's PropertyAccessor with an InvalidTypeException. This issue has been fixed in versions 4.1.30, 4.2.26 and 4.3.12.
AnalysisAI
Type confusion in API Platform Core's AbstractItemNormalizer allows authenticated API consumers to corrupt relational data by supplying IRIs pointing to resources of the wrong type during write operations (POST/PUT/PATCH). The root cause is that getResourceFromIri() omits the $operation context when calling IriConverter::getResourceFromIri(), silently bypassing the is_a type guard at IriConverter.php:86. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a low-privilege authenticated account capable of submitting POST, PUT, or PATCH requests to an API Platform endpoint that declares at least one writable relation property. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) is well-calibrated for this vulnerability: network-reachable, low complexity, requiring only low-privilege write access, with high integrity impact and no confidentiality or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated API user with write access submits a PATCH request to an endpoint exposing a writable untyped relation property - for example, an order's customer field expecting a User IRI - and instead supplies the IRI of an unrelated Product resource. Because the is_a guard is bypassed, the normalizer silently assigns the Product object to the customer property, corrupting the order record. … |
| Remediation | Upgrade to API Platform Core 4.1.30, 4.2.26, or 4.3.12, which restore type validation in AbstractItemNormalizer by correctly passing the $operation context to IriConverter::getResourceFromIri(), re-enabling the is_a type guard. … Detailed patch versions, workarounds, and compensating controls in full report. |
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