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

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat build of Keycloak是美国红帽（Red Hat）公司的一款用于单点登录的Web应用。 Red Hat Build of Keycloak存在访问控制错误漏洞，该漏洞源于User-Managed Access资源集端点访问控制不当，可能导致未经授权的资源修改。

CVSS 4.3 · Medium EPSS 0.27% · P17
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I. Basic Information for CVE-2026-4628

Vulnerability Information
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Vulnerability Title
Keycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to improper access control
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat build of Keycloak 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat build of Keycloak是美国红帽（Red Hat）公司的一款用于单点登录的Web应用。 Red Hat Build of Keycloak存在访问控制错误漏洞，该漏洞源于User-Managed Access资源集端点访问控制不当，可能导致未经授权的资源修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-4628

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-4628

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Vendor Advisories for CVE-2026-4628 (1)

Same Patch Batch · Red Hat · 2026-03-23 · 4 CVEs total

CVE-2026-4647 6.1 MEDIUM Binutils: out-of-bounds read in xcoff relocation processing in gnu binutils bfd library
CVE-2026-1940 5.1 MEDIUM Gstreamer: incomplete fix of cve-2026-1940
CVE-2026-4633 3.7 LOW Keycloak: keycloak: user enumeration via differential error messages

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-284

V. Comments for CVE-2026-4628

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