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Keycloak CVE-2026-9798

| EUVD-2026-32717 MEDIUM
Authentication Bypass by Primary Weakness (CWE-305)
2026-05-28 secalert@redhat.com GHSA-q6h7-xxp7-7429
Authentication Bypass
4.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
May 28, 2026 - 06:33 vuln.today

DescriptionNVD

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.

AnalysisAI

Keycloak's Client-Initiated Backchannel Authentication (CIBA) flow fails to enforce brute-force account lockouts, allowing an attacker with valid OAuth client credentials to continue initiating authentication requests and obtain tokens for a user account that should be temporarily locked. This undermines the core account-protection mechanism designed to throttle credential-stuffing and password-guessing campaigns. …

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CVE-2026-9798 vulnerability details – vuln.today
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