CVE-2026-9798Network attack vector

Account lockout bypass via unchecked CIBA status

Published May 28, 2026 · Updated May 28, 2026

Authentication bypass in Red Hat build of Keycloak allows remote attackers to obtain tokens for temporarily locked accounts through CIBA. The CIBA authentication endpoint omits the account lockout-status check and issues a valid token after the user approves the request. Exploitation requires non-default CIBA enablement, a configured confidential client, valid client credentials, and approval on the user’s authentication device.

CVSS severity4.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Red Hat build of Keycloak allows remote attackers to obtain tokens for temporarily locked accounts through CIBA. The CIBA authentication endpoint omits the account lockout-status check and issues a valid token after the user approves the request. Exploitation requires non-default CIBA enablement, a configured confidential client, valid client credentials, and approval on the user’s authentication device.

The record

CVE
CVE-2026-9798
Published
May 28, 2026
Updated
May 28, 2026
Vendor
389 Directory Server
Product
Red Hat build of Keycloak
Classifications
CWE-305, T1110
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat build of KeycloakAffected versions are unavailable in this record.

Published CVSS scores

4.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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