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CVE-2026-49858: API Platform Core vulnerable to cross-user attribute leak in JSON:API and HAL item normalizers due to missing isCacheKeySafe gate

medium Affects api-platform/core, api-platform/hal, api-platform/json-api. Feed 2026.10.29.1, updated 2026-10-28; published .

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

Package
api-platform/core Composer
Affected versions
>=2.6.0 and <4.1.29 or >=4.2.0 and <4.2.25 or >=4.3.0 and <4.3.8
Fixed in
4.1.29, 4.2.25, 4.3.8
Severity
medium  CVSS 5.9
Exploitation
not on CISA KEV · EPSS 0% (24.3th percentile)
Published
2026-07-10
Source
osv.dev

References

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

Package
api-platform/hal Composer
Affected versions
>=4.0.0 and <4.1.29 or >=4.2.0 and <4.2.25 or >=4.3.0 and <4.3.8
Fixed in
4.1.29, 4.2.25, 4.3.8
Severity
medium  CVSS 5.9
Exploitation
not on CISA KEV · EPSS 0% (24.3th percentile)
Published
2026-07-10
Source
osv.dev

References

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

Package
api-platform/json-api Composer
Affected versions
>=4.0.0 and <4.1.29 or >=4.2.0 and <4.2.25 or >=4.3.0 and <4.3.8
Fixed in
4.1.29, 4.2.25, 4.3.8
Severity
medium  CVSS 5.9
Exploitation
not on CISA KEV · EPSS 0% (24.3th percentile)
Published
2026-07-10
Source
osv.dev

References

CWE-524CWE-639
NVD recordapi-platform/core advisoriesapi-platform/hal advisoriesapi-platform/json-api advisories

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