Medium 6.8Published May 19, 2026

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

Updated under an hour ago (Oct 26, 2026, 6:20 PM ET)

Does this affect you?

It affects Red Hat build of Keycloak 26.4 and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat build of Keycloak 26.4

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-294
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: May 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak	from 26.4.12-1 not affected	CNA record
redhat build_of_keycloak redhat:build_of_keycloak	from 26.4 before 26.4.12	NVD

References

References

https://access.redhat.com/errata/RHSA-2026:19596	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:19597	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-37982	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455329	issue-tracking, x-refsource-redhat, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.