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CVE-2026-18569— Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak Keycloak是Keycloak组织开源的一款身份认证与权限管理软件。 Keycloak存在加密问题漏洞，该漏洞源于keycloak-services组件的backchannel注销端点存在缺陷，当OIDC身份提供程序配置为跳过签名验证时，系统错误接受无加密签名的注销请求，可能导致攻击者强制用户注销，干扰其工作。

CVSS 3.7 · Low EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Build of Keycloak any affected
any affected
any affected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-18569

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the backchannel logout endpoint of the keycloak-services component, which is part of the Red Hat Build of Keycloak. This component handles authentication and session management for applications. The issue occurs when an OIDC identity provider is configured to skip signature validation. In this specific setup, the system incorrectly accepts logout requests that have no cryptographic signature. An attacker who knows certain technical details about a user's session can use this flaw to force that user to be logged out, potentially disrupting their work.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak Keycloak是Keycloak组织开源的一款身份认证与权限管理软件。 Keycloak存在加密问题漏洞，该漏洞源于keycloak-services组件的backchannel注销端点存在缺陷，当OIDC身份提供程序配置为跳过签名验证时，系统错误接受无加密签名的注销请求，可能导致攻击者强制用户注销，干扰其工作。
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:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-18569

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III. Intelligence Information for CVE-2026-18569

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Vendor Advisories for CVE-2026-18569 (2)

Same Patch Batch · Red Hat · 2026-08-04 · 6 CVEs total

CVE-2026-42169 7.3 HIGH Gimp: gimp apng loader heap-buffer-overflow when fctl width exceeds ihdr width (file-png.c
CVE-2026-68743 5.5 MEDIUM Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v
CVE-2026-18103 4.9 MEDIUM Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi
CVE-2026-17614 4.4 MEDIUM Wildfly-core: path traversal on wildfly domain controller
CVE-2026-68744 3.3 LOW Sssd: sssd: nss responder uninitialized heap disclosure in initgroups reply

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-347

V. Comments for CVE-2026-18569

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