CVE-2026-37982
Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
- State
- Published
- Severity
- 6.8 Medium
- Published
- May 19, 2026
- Updated
- Oct 29, 2026
- Reserved
- Apr 6, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N | redhat |
Weaknesses
- CWE-294 Authentication Bypass by Capture-replay
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4.12Red Hat |
References
- RHSA-2026:19596vendor-advisory
- RHSA-2026:19597vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-37982vdb-entry
- RHBZ#2455329issue-tracking
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