Is CVE-2026-18967 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18967?

CVE-2026-18967 has a CVSS v3 severity of MEDIUM (6.4).

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CVE-2026-18967

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.