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.

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Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

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.

History

Tue, 19 May 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Keycloak
Vendors & Products Redhat build Of Keycloak

Tue, 19 May 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-294
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 19 May 2026 12:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1025
CWE-602

Tue, 19 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 19 May 2026 11:30:00 +0000

Type Values Removed Values Added
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.
Title Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
First Time appeared Redhat
Redhat build Keycloak
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-05-19T13:38:00.236Z

Reserved: 2026-04-06T07:48:39.722Z

Link: CVE-2026-37982

cve-icon Vulnrichment

Updated: 2026-05-19T13:37:11.234Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-05-19T12:16:18.610

Modified: 2026-05-19T15:16:30.613

Link: CVE-2026-37982

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-19T00:00:00Z

Links: CVE-2026-37982 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T14:30:06Z

Weaknesses