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CVE-2026-49858

29
FAUCET Score

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.

First published: Jul 1, 2026Last modified: Jul 1, 2026

Impacted Technologies

VendorProductVersion(s)CPE
Api-PlatformApi-Platform/Hal
>= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8CNA affected
Api-PlatformApi-Platform/Json-Api
>= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8CNA affected
Api-PlatformCore
>= 2.6.0, < 4.1.29, >= 4.2.0, < 4.2.25, >= 4.3.0, < 4.3.8CNA affected

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.21%
Probability of exploitation in next 30 days
EPSS Percentile
11.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0021 is in the 1st percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

composerpatch availablevia ghsa
Product: api-platform/coreFixed in: 4.1.29
composerpatch availablevia ghsa
Product: api-platform/coreFixed in: 4.2.25
composerpatch availablevia ghsa
Product: api-platform/coreFixed in: 4.3.8
composerpatch availablevia ghsa
Product: api-platform/json-apiFixed in: 4.1.29
composerpatch availablevia ghsa
Product: api-platform/json-apiFixed in: 4.2.25
composerpatch availablevia ghsa
Product: api-platform/json-apiFixed in: 4.3.8
composerpatch availablevia ghsa
Product: api-platform/halFixed in: 4.1.29
composerpatch availablevia ghsa
Product: api-platform/halFixed in: 4.2.25
composerpatch availablevia ghsa
Product: api-platform/halFixed in: 4.3.8

Vendor Advisories (1)

composerGHSA-pjhx-3c3w-9v23medium

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

Jul 10, 2026

References

github.com / api-platform/core/security/advisories/GHSA-pjhx-3c3w-9v23