CVE-2026-37982
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.
Statement
This vulnerability has a Moderate impact on Red Hat Build of Keycloak (RHBK). A flaw in Keycloak's WebAuthn flow allows an attacker who gains access to an execute-actions email link to replay tokens containing WEBAUTHN_REGISTER or WEBAUTHN_PASSWORDLESS_REGISTER. This enables unauthorized WebAuthn registration with the attacker's authenticator on the victim's account, leading to account takeover. Exploitation requires WebAuthn required actions to be enabled and the email link to be compromised.
Mitigation
To mitigate this issue, consider disabling WebAuthn required actions in Keycloak if they are not essential for your deployment. This will prevent the vulnerable token replay mechanism from being exploited. Consult Keycloak documentation for specific configuration steps to disable WebAuthn required actions. Note that applying configuration changes may require a service restart and could impact functionality relying on WebAuthn registration.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.8 | N/A | 6.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
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