Vulnerability Details CVE-2026-18967
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 4.0%
CVSS Severity
CVSS v3 Score 6.4
References
Products affected by CVE-2026-18967
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cpe:2.3:a:redhat:build_of_keycloak:-
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cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-