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.
- Score
- CVSS 3.1 8.1 High
- Status
- Analyzed - secalert@redhat.com
- Published
- 2026-08-06
- Last modified
- 2026-08-06
- Weaknesses
- CWE-294
Affected products
- Build Keycloak (Redhat)
- Build Of Keycloak (Redhat)
- Jboss Enterprise Application Platform Expansion Pack (Redhat)
- Jbosseapxp (Redhat)
- Red Hat Single Sign On (Redhat)
References
- https://access.redhat.com/security/cve/CVE-2026-18967
- https://bugzilla.redhat.com/show_bug.cgi?id=2511604
