CVE-2026-4628: Keycloak has Improper Access Control that allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false

March 23, 2026 (updated April 13, 2026)

A flaw was found in Keycloak. An improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This occurs due to incomplete enforcement of access control checks on PUT operations to the resource_set endpoint. This issue enables unauthorized modification of protected resources, impacting data integrity.

References

access.redhat.com/security/cve/CVE-2026-4628
bugzilla.redhat.com/show_bug.cgi?id=2450240
github.com/advisories/GHSA-4pgc-gfrr-wcmg
github.com/keycloak/keycloak
nvd.nist.gov/vuln/detail/CVE-2026-4628

Code Behaviors & Features

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