Vulnerability-Lookup

CVE-2026-49858 (GCVE-0-2026-49858)

Vulnerability from cvelistv5 – Published: 2026-07-01 19:24 – Updated: 2026-07-02 12:20

Title

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

Summary

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.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-524 - Use of Cache Containing Sensitive Information
CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/api-platform/core/security/adv…	x_refsource_CONFIRM

Impacted products

3 products

Vendor	Product	Version
api-platform	core	Affected: >= 2.6.0, < 4.1.29 Affected: >= 4.2.0, < 4.2.25 Affected: >= 4.3.0, < 4.3.8
api-platform	api-platform/hal	Affected: >= 2.6.0, < 4.1.29 Affected: >= 4.2.0, < 4.2.25 Affected: >= 4.3.0, < 4.3.8
api-platform	api-platform/json-api	Affected: >= 2.6.0, < 4.1.29 Affected: >= 4.2.0, < 4.2.25 Affected: >= 4.3.0, < 4.3.8

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JSON

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FKIE_CVE-2026-49858

Vulnerability from fkie_nvd - Published: 2026-07-01 20:17 - Updated: 2026-07-02 18:41

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/api-platform/core/security/advisories/GHSA-pjhx-3c3w-9v23

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
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          "product": "core",
          "vendor": "api-platform",
          "versions": [
            {
              "status": "affected",
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            },
            {
              "status": "affected",
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            },
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        },
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GHSA-PJHX-3C3W-9V23

Vulnerability from github – Published: 2026-07-10 14:32 – Updated: 2026-07-10 14:32

Summary

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

Details

Impact

#[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 is the same vulnerability class as GHSA-428q-q3vv-3fq3 / CVE-2025-31485, which fixed only the GraphQL ItemNormalizer. The JSON:API and HAL paths were not addressed at the time.

Exploitation conditions

Exploitation requires all of the following to coincide:

The application exposes a resource via the JSON:API and/or HAL formats.
At least one property of that resource uses #[ApiProperty(security: ...)] with a predicate whose result depends on the current user (or on per-request state).
A request from a user for whom the predicate evaluates to true populates componentsCache before a request from a user for whom the predicate evaluates to false, within the lifetime of the same PHP process.
The deployment uses a long-running PHP runtime that keeps the normalizer instance alive across requests (FrankenPHP worker mode, RoadRunner, Swoole, ReactPHP, etc.). With classic php-fpm workers the cache only survives the duration of a single request, which makes the issue much harder to observe in practice.

Patches

4.1.29
4.2.25
4.3.8

All three branches receive patched releases of api-platform/core, api-platform/json-api, and api-platform/hal.

Workarounds

Override the JSON:API and HAL ItemNormalizer services to gate $context['cache_key'] with a resource-class security check, or avoid #[ApiProperty(security: ...)] on resources served as JSON:API or HAL until the patch is applied. Pinning the deployment to classic php-fpm workers also limits exposure since the cache does not survive across requests.

Credits

Tillmann Baumgart (@tillmon) — originally identified the broader cache-key gap and proposed moving isCacheKeySafe to AbstractItemNormalizer.
Antoine Bluchet (@soyuka) — extended the gate to JSON:API and HAL normalizers.

Severity

5.9 (Medium)


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

Show details on source website

JSON

To clipboard

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            },
            {
              "fixed": "4.1.29"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "4.3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/json-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.1.29"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/json-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/json-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "4.3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/hal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.1.29"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/hal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "api-platform/hal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "4.3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49858"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-524",
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-10T14:32:01Z",
    "nvd_published_at": "2026-07-01T20:17:10Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\n`#[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 `$context[\u0027cache_key\u0027]`, which is set unconditionally before delegating to the parent normalizer. The component structure (attributes, relationships, links) computed for one request can therefore be reused for a subsequent request whose user has a different set of accessible properties. A user with lower privileges may end up seeing the structure of properties that the security predicate would otherwise have hidden for them.\n\nThis is the same vulnerability class as [GHSA-428q-q3vv-3fq3](https://github.com/api-platform/core/security/advisories/GHSA-428q-q3vv-3fq3) / CVE-2025-31485, which fixed only the GraphQL `ItemNormalizer`. The JSON:API and HAL paths were not addressed at the time.\n\n### Exploitation conditions\n\nExploitation requires all of the following to coincide:\n\n- The application exposes a resource via the JSON:API and/or HAL formats.\n- At least one property of that resource uses `#[ApiProperty(security: ...)]` with a predicate whose result depends on the current user (or on per-request state).\n- A request from a user for whom the predicate evaluates to `true` populates `componentsCache` before a request from a user for whom the predicate evaluates to `false`, within the lifetime of the same PHP process.\n- The deployment uses a long-running PHP runtime that keeps the normalizer instance alive across requests (FrankenPHP worker mode, RoadRunner, Swoole, ReactPHP, etc.). With classic `php-fpm` workers the cache only survives the duration of a single request, which makes the issue much harder to observe in practice.\n\n### Patches\n\n- 4.1.29\n- 4.2.25\n- 4.3.8\n\nAll three branches receive patched releases of `api-platform/core`, `api-platform/json-api`, and `api-platform/hal`.\n\n### Workarounds\n\nOverride the JSON:API and HAL `ItemNormalizer` services to gate `$context[\u0027cache_key\u0027]` with a resource-class security check, or avoid `#[ApiProperty(security: ...)]` on resources served as JSON:API or HAL until the patch is applied. Pinning the deployment to classic `php-fpm` workers also limits exposure since the cache does not survive across requests.\n\n### Credits\n\n- Tillmann Baumgart (@tillmon) \u2014 originally identified the broader cache-key gap and proposed moving `isCacheKeySafe` to `AbstractItemNormalizer`.\n- Antoine Bluchet (@soyuka) \u2014 extended the gate to JSON:API and HAL normalizers.",
  "id": "GHSA-pjhx-3c3w-9v23",
  "modified": "2026-07-10T14:32:01Z",
  "published": "2026-07-10T14:32:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/api-platform/core/security/advisories/GHSA-pjhx-3c3w-9v23"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49858"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/api-platform/core"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "API Platform Core vulnerable to cross-user attribute leak in JSON:API and HAL item normalizers due to missing isCacheKeySafe gate"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-49858 (GCVE-0-2026-49858)

FKIE_CVE-2026-49858

GHSA-PJHX-3C3W-9V23

Impact

Exploitation conditions

Patches

Workarounds

Credits

Tags

Sightings

Nomenclature