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CVE-2026-18967— Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow

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 存在授权问题漏洞，该漏洞源于在配置为使用IdP-Initiated流程的SAML代理时未能强制执行SAML断言中的OneTimeUse条件，可能导致攻击者重放有效的未使用断言，劫持用户会话并获取未授权访问。

CVSS 6.4 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Build of Keycloak any affected
any affected
any affected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any affected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-18967

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 授权问题漏洞
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 存在授权问题漏洞，该漏洞源于在配置为使用IdP-Initiated流程的SAML代理时未能强制执行SAML断言中的OneTimeUse条件，可能导致攻击者重放有效的未使用断言，劫持用户会话并获取未授权访问。
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 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-2026-18967

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III. Intelligence Information for CVE-2026-18967

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Vendor Advisories for CVE-2026-18967 (1)

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-294

V. Comments for CVE-2026-18967

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