CVE-2026-37982

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

Published: May 19, 2026Updated: Jun 3, 2026 Sources: CVE List NVDCWE-294

6.8MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-294

Affected Products

Red Hat

commercial·USaka redhat

build of keycloakOn-prem

Operating Systems / linux-distro

Red Hat build of Keycloak 26.4On-premWeb App

Web & CMS Plugins

Red Hat build of Keycloak 26.4.12On-prem

Operating Systems / linux-distro

Exploitability

Official Patch Available

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Defense Evasion

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References

https://access.redhat.com/errata/RHSA-2026:19596

access.redhat.com

https://access.redhat.com/errata/RHSA-2026:19597

access.redhat.com

https://access.redhat.com/security/cve/CVE-2026-37982

access.redhat.com

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