CVE-2026-4633— Keycloak: keycloak: user enumeration via differential error messages
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I. Basic Information for CVE-2026-4633
Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: user enumeration via differential error messages
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过错误消息导致的信息暴露
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，该漏洞源于启用组织时身份优先登录流程中的差异错误消息，可能导致用户枚举和信息泄露。
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: |
II. Public POCs for CVE-2026-4633
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- 2450247 – (CVE-2026-4633) CVE-2026-4633 keycloak: Keycloak: User enumeration via differential error messagesissue-trackingx_refsource_REDHAT
- https://nvd.nist.gov/vuln/detail/CVE-2026-4633
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-2026-4628 | 4.3 MEDIUM | Keycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to |
IV. Related Vulnerabilities
Same product: Red Hat Build of Keycloak
- CVE-2026-7500
Org.keycloak.keycloak-services: improper access control on k - CVE-2026-37980
Org.keycloak.forms.login: keycloak: keycloak: arbitrary code - CVE-2026-37977
Keycloak: org.keycloak.protocol.oidc.grants.ciba: keycloak: - CVE-2026-4874
Org.keycloak.protocol.oidc.grants: org.keycloak.services.man - CVE-2026-4628
Keycloak: org.keycloak.authorization: keycloak: unauthorized
Same vendor: Red Hat
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Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
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Openvswitch: open vswitch: denial of service via malformed f - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de
Same weakness: CWE-209
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Sensitive Data Disclosure in BigQuery via Materialized View
V. Comments for CVE-2026-4633
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