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CVE-2026-37982— Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay

CVSS 6.8 · Medium EPSS 0.05% · P17

Affected Version Matrix 4

VendorProductVersion RangeStatus
Red HatRed Hat build of Keycloak 26.426.4.12-1< *unaffected
26.4-17< *unaffected
26.4-17< *unaffected
Red HatRed Hat build of Keycloak 26.4.12anyunaffected
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I. Basic Information for CVE-2026-37982

Vulnerability Information
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Vulnerability Title
Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay `ExecuteActionsActionToken` tokens within Keycloak's WebAuthn (Web Authentication) flow. By intercepting an execute-actions email link, an attacker can register their own authenticator to a victim's account. This leads to unauthorized enrollment of a hardware-backed credential, enabling persistent account takeover.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
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WebAuthn流程中的身份验证漏洞，允许远程攻击者重放ExecuteActionsActionToken令牌，可能导致攻击者注册自己的验证器到受害者账户，实现账户接管。
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 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red HatRed Hat build of Keycloak 26.4.12-cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-37982

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III. Intelligence Information for CVE-2026-37982

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Advisory · 2

Same Patch Batch · Red Hat · 2026-05-19 · 11 CVEs total

CVE-2026-75048.1 HIGHOrg.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-75077.5 HIGHOrg.keycloak/keycloak-services: session fixation in oidc login flow that can lead to accou
CVE-2026-73077.5 HIGHKeycloak: keycloak: denial of service via specially crafted saml input
CVE-2026-75717.1 HIGHKeycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-46306.8 MEDIUMKeycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-379796.5 MEDIUMKeycloak: keycloak: information disclosure via oidc token introspection endpoint audience
CVE-2026-89225.4 MEDIUMOrg.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-379784.9 MEDIUMKeycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-379814.3 MEDIUMKeycloak: org.keycloak.authorization: keycloak: information disclosure via broken access c
CVE-2026-88304.3 MEDIUMKeycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credenti

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat

V. Comments for CVE-2026-37982

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