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CVE-2026-1529— Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation

CVSS 8.1 · High EPSS 0.01% · P2
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I. Basic Information for CVE-2026-1529

Vulnerability Information
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Vulnerability Title
Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
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，该漏洞源于缺乏加密签名验证，攻击者可能通过修改邀请令牌JWT有效载荷中的组织ID和目标电子邮件，成功自注册到未经授权的组织。
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 26.2 26.2.13-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red HatRed Hat build of Keycloak 26.2 26.2-15 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red HatRed Hat build of Keycloak 26.2 26.2-15 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red HatRed Hat build of Keycloak 26.2.13-cpe:/a:redhat:build_keycloak:26.2::el9
Red HatRed Hat build of Keycloak 26.4 26.4.9-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-11 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-10 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4.9-cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-1529

#POC DescriptionSource LinkShenlong Link
1CVE-2026-1529 (PoC) is a critical vulnerability in Keycloak that allows unauthorized organization registration through improper invitation token validation. This exploit tool demonstrates the vulnerability by manipulating JWT tokens to register users in unauthorized organizations.https://github.com/ninjazan420/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validationPOC Details
2Keycloak: Unauthorized organization registration via improper invitation token validationhttps://github.com/0x240x23elu/CVE-2026-1529POC Details
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III. Intelligence Information for CVE-2026-1529

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Same Patch Batch · Red Hat · 2026-02-09 · 4 CVEs total

CVE-2026-14868.8 HIGHOrg.keycloak.protocol.oidc.grants: disabled identity providers are still accepted for jwt
CVE-2025-147785.4 MEDIUMKeycloak: incorrect ownership checks in /uma-policy/
CVE-2025-148315.3 MEDIUMGnutls: gnutls: denial of service via excessive resource consumption during certificate ve

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-347

V. Comments for CVE-2026-1529

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