What’s Vulnerable › Vulnerabilities

CVE-2026-4628: Keycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to improper access control

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-23 · updated 2026-10-22
• Weakness: CWE-284

Description

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.

Affected products

• Red Hat build of Keycloak 26.4: all versions

References

• https://access.redhat.com/errata/RHSA-2026:19596
• https://access.redhat.com/security/cve/CVE-2026-4628
• https://bugzilla.redhat.com/show_bug.cgi?id=2450240

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