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CVE-2026-37981— Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access control in user lookup endpoint

CVSS 4.3 · Medium EPSS 0.03% · P10

Affected Version Matrix 4

VendorProductVersion RangeStatus
Red HatRed Hat build of Keycloak 26.426.4.12-1< *unaffected
26.4-17< *unaffected
26.4-17< *unaffected
Red HatRed Hat build of Keycloak 26.4.12anyunaffected
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I. Basic Information for CVE-2026-37981

Vulnerability Information
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Vulnerability Title
Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access control in user lookup endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1220
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于Account Resources用户查找端点中的访问控制漏洞，允许拥有至少一个用户管理访问资源的远程经过身份验证的用户通过发送带有任意用户名或电子邮件值的特制请求，枚举和收集所有领域用户的个人身份信息。
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat build of Keycloak 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4.12-cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-37981

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III. Intelligence Information for CVE-2026-37981

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Same Patch Batch · Red Hat · 2026-05-19 · 11 CVEs total

CVE-2026-75048.1 HIGHOrg.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-75077.5 HIGHOrg.keycloak/keycloak-services: session fixation in oidc login flow that can lead to accou
CVE-2026-73077.5 HIGHKeycloak: keycloak: denial of service via specially crafted saml input
CVE-2026-75717.1 HIGHKeycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-379826.8 MEDIUMKeycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauth
CVE-2026-46306.8 MEDIUMKeycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-379796.5 MEDIUMKeycloak: keycloak: information disclosure via oidc token introspection endpoint audience
CVE-2026-89225.4 MEDIUMOrg.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-379784.9 MEDIUMKeycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-88304.3 MEDIUMKeycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credenti

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-1220

V. Comments for CVE-2026-37981

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