CVE-2026-37982
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedMay 19, 2026
First seenMay 19, 2026
Weakness typeCWE-294CWE-294
How to fix
Update
- redhat build_of_keycloak26.4.12 or later
- org.keycloak:keycloak-services26.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.4 ≤ v < 26.4.12 | 26.4.12 |
| org.keycloak:keycloak-servicesMaven | v < 26.6.2 | 26.6.2 |
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