CVE-2026-9798— Keycloak: keycloak: brute-force protection bypass in ciba flow
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | any | affected |
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I. Basic Information for CVE-2026-9798
Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: brute-force protection bypass in ciba flow
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用基本弱点进行的认证绕过
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于当用户账户因重复登录失败尝试被临时锁定时，具有有效客户端凭据的攻击者可利用客户端发起的反向信道认证流程绕过暴力破解保护，可能导致即使在账户应被锁定时仍能继续身份验证尝试和令牌发放，从而可能进行进一步的未经授权访问尝试。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Build of Keycloak | - | cpe:/a:redhat:build_keycloak: |
II. Public POCs for CVE-2026-9798
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9798 (1)
- 🔗 2482470 – (CVE-2026-9798) CVE-2026-9798 keycloak: Keycloak: Brute-force protection bypass in CIBA flow Read full article issue-trackingx_refsource_REDHAT
Other References for CVE-2026-9798 (1)
Same Patch Batch · Red Hat · 2026-05-28 · 14 CVEs total
| CVE-2026-4408 | 9.0 CRITICAL | Samba: remote code execution in samr |
| CVE-2026-9804 | 7.7 HIGH | Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read |
| CVE-2026-9795 | 7.3 HIGH | Keycloak: keycloak: privilege escalation via improper scope mapping enforcement |
| CVE-2026-44604 | 7.0 HIGH | Rpm: command injection in rpmuncompress dountar() via unescaped archive top-level director |
| CVE-2026-9802 | 6.8 MEDIUM | Keycloak: keycloak: unauthorized account access via replayed refresh tokens after cluster |
| CVE-2026-9792 | 6.5 MEDIUM | Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition |
| CVE-2026-9796 | 6.5 MEDIUM | Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnera |
| CVE-2026-9793 | 5.9 MEDIUM | Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing |
| CVE-2026-9794 | 5.3 MEDIUM | Keycloak: keycloak: information disclosure via saml ecp endpoint |
| CVE-2026-9803 | 5.3 MEDIUM | Keycloak: keycloak: denial of service via malformed authorization header |
| CVE-2026-9801 | 4.9 MEDIUM | Keycloak: keycloak: denial of service via malformed ldap password policy response |
| CVE-2026-9791 | 4.3 MEDIUM | Keycloak-rhel9: organization data leak after feature disabled in keycloak |
| CVE-2026-10028 | 4.3 MEDIUM | Glib-networking: infinite loop in glib-networking gnutls backend allows remote denial of s |
IV. Related Vulnerabilities
Same product: Red Hat Build of Keycloak
- CVE-2026-11986
Keycloak-rest-admin-ui-ext: authorization bypass vulnerabili - CVE-2026-11577
Keycloak: keycloak: privilege escalation via partialimport f - CVE-2026-9796
Keycloak: keycloak: privilege escalation via time-of-check t - CVE-2026-9795
Keycloak: keycloak: privilege escalation via improper scope - CVE-2026-9793
Keycloak: keycloak: security policy bypass in jwe-encrypted
Same vendor: Red Hat
- CVE-2026-12398
Galaxy_ng: shell injection in legacy role import via unsanit - CVE-2026-42014
Gnutls: fix use-after-free in gnutls_pkcs11_token_set_pin - CVE-2026-1767
Localsearch: tracker-miners: gnome localsearch mp3 extractor - CVE-2026-1766
Localsearch: tracker-miners: gnome localsearch mp3 extractor - CVE-2026-1765
Localsearch: tracker-miners: gnome localsearch mp3 extractor
Same weakness: CWE-305
- CVE-2025-7064
Freelance Security Lock – Access to Windows OS - CVE-2026-25555
OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header - CVE-2026-9047
Devolutions Server 安全漏洞 - CVE-2026-41054
Missing exit out of permission check in haveged could lead t - CVE-2026-6334
OAuth authorization code client binding not enforced during
V. Comments for CVE-2026-9798
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