CVE-2026-9087— Keycloak: cross-session email verification proof not bound to upstream identity in first-broker-login
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | any | affected |
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I. Basic Information for CVE-2026-9087
Vulnerability Information
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Vulnerability Title
Keycloak: cross-session email verification proof not bound to upstream identity in first-broker-login
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
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，该漏洞源于跨会话验证证明仅基于本地用户ID和IdP别名，未绑定实际验证的上游身份，可能导致同一IdP上的第二个上游账户链接到受害者本地账户。
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-2026-9087
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9087 (2)
Same Patch Batch · Red Hat · 2026-05-20 · 4 CVEs total
| CVE-2026-9064 | 7.5 HIGH | 389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() |
| CVE-2026-9149 | 6.5 MEDIUM | Libsolv: heap buffer overflow in libsolv repo_add_solv via negative maxsize from crafted . |
| CVE-2026-9150 | 6.5 MEDIUM | Libsolv: stack-based buffer overflow in libsolv's debian metadata parser when handling sha |
IV. Related Vulnerabilities
Same product: Red Hat Build of Keycloak
- CVE-2026-8922
Org.keycloak/keycloak-services: keycloak: org.keycloak.proto - CVE-2026-8830
Keycloak: org.keycloak/keycloak-services: keycloak: policy b - 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:
Same vendor: Red Hat
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Gnutls: gnutls: certificate validation bypass due to imprope - CVE-2026-5260
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Same weakness: CWE-639
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V. Comments for CVE-2026-9087
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