Keycloak: Unauthorized account takeover via WebAuthn token replay
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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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-37982US | —OT elevated | — | ||
A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay `ExecuteActionsActionToken` tokens within Keycloak's WebAuthn (Web Authentication… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:19596WEB
- https://access.redhat.com/errata/RHSA-2026:19597WEB
- https://access.redhat.com/security/cve/CVE-2026-37982WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2455329WEB
- https://github.com/keycloak/keycloakPACKAGE
- https://github.com/keycloak/keycloak/commit/2d1a24f501454a44c52daa62855419b31dc499c1WEB
- https://github.com/keycloak/keycloak/pull/49126WEB
- https://github.com/keycloak/keycloak/releases/tag/26.6.2WEB
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