Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay

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Summary

CVECVE-2026-37982
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-19 12:16:18 UTC
Updated2026-05-20 17:16:22 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS: 0.000170000 probability, percentile 0.045050000 (date 2026-05-27)

Problem Types: CWE-294 | CWE-294 CWE-294 Authentication Bypass by Capture-replay

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
3.1CNACVSS6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Build Of Keycloak 26.4 unaffected 26.4.12-1 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.4 unaffected 26.4-17 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.4 unaffected 26.4-17 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.4.12 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:19596 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:19597 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-37982 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-04-06T08:00:08.777ZReported to Red Hat.
CNA2026-05-19T00:00:00.000ZMade public.

Workarounds

CNA: 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.

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