Auth bypass in Api-platform Api-platform/hal

CVE-2026-49858

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 attribu…

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-49858?
CVE-2026-49858 is a medium-severity vulnerability in Api-platform Api-platform/hal, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.9/10. Published 2026-07-01.
How severe is CVE-2026-49858?
Medium severity. CVSS v3 base score is 5.9 out of 10.