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CVE-2026-8830— Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credential registration via client-side javascript manipulation

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.

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，该漏洞源于服务端processAction未验证新凭证参数，可能导致绕过WebAuthn策略创建不合规凭证。

CVSS 4.3 · Medium EPSS 0.44% · P36

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.4 26.4.13-1< * unaffected
26.4-19< * unaffected
26.4-19< * unaffected
Red Hat Red Hat build of Keycloak 26.4.13 any unaffected
Red Hat Red Hat build of Keycloak 26.6 26.6.3-3< * unaffected
26.6-6< * unaffected
26.6-6< * unaffected
Red Hat Red Hat build of Keycloak 26.6.3 any unaffected
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I. Basic Information for CVE-2026-8830

Vulnerability Information
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Vulnerability Title
Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credential registration via client-side javascript manipulation
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用客户端的认证机制
Source: CVE Program / CVE List V5
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，该漏洞源于服务端processAction未验证新凭证参数，可能导致绕过WebAuthn策略创建不合规凭证。
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 26.4 26.4.13-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-19 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-19 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.13 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.6 26.6.3-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-6 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-6 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.3 - cpe:/a:redhat:build_keycloak:26.6::el9

II. Public POCs for CVE-2026-8830

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III. Intelligence Information for CVE-2026-8830

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Vendor Advisories for CVE-2026-8830 (4)

Other References for CVE-2026-8830 (2)

Same Patch Batch · Red Hat · 2026-05-19 · 10 CVEs total

CVE-2026-7504 8.1 HIGH Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-7507 7.5 HIGH Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to accou
CVE-2026-7571 7.1 HIGH Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-4630 6.8 MEDIUM Keycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-37982 6.8 MEDIUM Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauth
CVE-2026-37979 6.5 MEDIUM Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience
CVE-2026-8922 5.4 MEDIUM Org.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-37978 4.9 MEDIUM Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-37981 4.3 MEDIUM Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access c

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-603

V. Comments for CVE-2026-8830

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