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CVE-2026-19607— Keycloak-services: keycloak-services: broker-originated username collision causes account lockout

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
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.

在 Keycloak 的 keycloak-services 组件的“首个经纪人登录”流程中发现了一个漏洞。该组件负责处理用户通过外部身份提供商登录时的初始身份验证和账户关联操作。此漏洞允许攻击者在外部身份提供商上注册一个与 Keycloak 中存在的用户名相匹配的名称，从而触发 Keycloak 中的用户名冲突，导致合法用户被锁定在其账户之外。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-19607

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: broker-originated username collision causes account lockout
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.4 26.4-26 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-26 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.16-2 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.16 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.16 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-19607

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III. Intelligence Information for CVE-2026-19607

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Vendor Advisories for CVE-2026-19607 (2)

Other References for CVE-2026-19607 (4)

Same Patch Batch · Red Hat · 2026-09-16 · 9 CVEs total

CVE-2026-74909 8.1 HIGH Keycloak-services: keycloak-services: incomplete fix for cve-2026-15573 allows policy enfo
CVE-2026-79651 7.5 HIGH Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching
CVE-2026-18212 7.5 HIGH Keycloak-services: keycloak-services: saml redirect deflate helpers leak native zlib state
CVE-2026-42784 7.4 HIGH Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusio
CVE-2026-17526 7.2 HIGH Keycloak-services: keycloak-services: privilege escalation via impersonation role allows t
CVE-2026-92615 6.6 MEDIUM Flightctl: flightctl: package-global go-git https transport mutated per-repo -- cross-tena
CVE-2026-92358 6.4 MEDIUM Keycloak-services: keycloak-services: residual cross-browser account-link proof allows sil
CVE-2026-92091 5.9 MEDIUM Jwcrypto: jwcrypto: denial of service via o(n^2) duplicate check on unbounded jwk key_ops

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-287

V. Comments for CVE-2026-19607

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