CVE-2026-37982

Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay

Medium · published May 19, 2026

CVSS v3.1
6.8
EPSS
1%
Percentile
46.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00570 · 46.4th percentile
Published
2026-05-19T10:52Z
EPSS history
Timeline
  • 19 MAY 10:52Z
    Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay
    cvelistv5