CVE-2026-3429

A flaw was identified in the Account REST API of Keycloak that allows a user authenticated at a lower security level to perform sensitive actions intended only for higher-assurance sessions. Specifically, an attacker who has already obtained a victim’s password can delete the victim’s registered MFA/OTP credential without first proving possession of that factor. The attacker can then register their own MFA device, effectively taking full control of the account. This weakness undermines the intended protection provided by multi-factor authentication.

CVSS v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:6477
https://access.redhat.com/errata/RHSA-2026:6478
https://access.redhat.com/security/cve/CVE-2026-3429
https://bugzilla.redhat.com/show_bug.cgi?id=2443771

Configurations

No configuration.

History

02 Apr 2026, 14:16

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:6477 - () https://access.redhat.com/errata/RHSA-2026:6478 -
Summary		(es) Se identificó una vulnerabilidad en la API REST de Cuentas de Keycloak que permite a un usuario autenticado con un nivel de seguridad inferior realizar acciones sensibles destinadas únicamente a sesiones de mayor garantía. Específicamente, un atacante que ya ha obtenido la contraseña de una víctima puede eliminar la credencial MFA/OTP registrada de la víctima sin probar primero la posesión de ese factor. El atacante puede entonces registrar su propio dispositivo MFA, tomando efectivamente el control total de la cuenta. Esta debilidad socava la protección prevista proporcionada por la autenticación multifactor.

11 Mar 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-11 17:16

Updated : 2026-06-17 10:43

NVD link : CVE-2026-3429

Mitre link : CVE-2026-3429

CVE.ORG link : CVE-2026-3429

JSON object : View

Products Affected

No product.

CWE

CWE-284

Improper Access Control

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