# CVE-2026-9798

## Summary

- **CVE ID:** CVE-2026-9798
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
- **CWE:** CWE-305
- **Published:** May 28, 2026
- **Last Modified:** Aug 20, 2026

## Description

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.

## Affected Products

- Red Hat — Red Hat build of Keycloak 26.4 (26.4-22)
- Red Hat — Red Hat build of Keycloak 26.4 (26.4.14-1)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6-11)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6.5-1)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-9798)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2482470)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50846)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50847)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50848)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50849)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._