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.
Affected products
redhat: build of keycloak
References4
- access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-37982 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2455329 Vendor Advisory
Metrics
- CVSS 3.1
-
6.8
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 39 · as of 14 November 2026
- CWE
- CWE-294
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.