CVE-2026-3429
MEDIUM
GHSA-8g9r-9wjw-37j4
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
2Description
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.
Analysis
Keycloak's Account REST API improperly validates session assurance levels, enabling authenticated attackers with a victim's password to remove MFA/OTP credentials without re-authentication and subsequently register their own authenticator. This allows complete account takeover by bypassing the intended multi-factor authentication protections. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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