CVE-2026-37982: Keycloak: Unauthorized account takeover via WebAuthn token replay
(updated )
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.
References
- access.redhat.com/errata/RHSA-2026:19596
- access.redhat.com/errata/RHSA-2026:19597
- access.redhat.com/security/cve/CVE-2026-37982
- bugzilla.redhat.com/show_bug.cgi?id=2455329
- github.com/advisories/GHSA-w4p5-rfh6-cwrv
- github.com/keycloak/keycloak/commit/2d1a24f501454a44c52daa62855419b31dc499c1
- github.com/keycloak/keycloak/pull/49126
- github.com/keycloak/keycloak/releases/tag/26.6.2
- nvd.nist.gov/vuln/detail/CVE-2026-37982
Code Behaviors & Features
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