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.

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Produits concernés

• Red Hat Build of Keycloak
• Red Hat JBoss Enterprise Application Platform Expansion Pack
• Red Hat Single Sign-On 7
• Redhat build of keycloak
• Redhat jboss enterprise application platform expansion pack

Scores CVSS

Faiblesses (CWE)

• CWE-294

Références

• https://access.redhat.com/security/cve/CVE-2026-18967 Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2511604 Permissions Required

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories