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CVE-2026-9087

Keycloak: cross-session email verification proof not bound to upstream identity in first-broker-login

CVSS 6.4 MEDIUMEPSS 0.3%CWE-639
A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Productos afectados
Red Hat · Red Hat build of Keycloak 26.6Red Hat · Red Hat build of Keycloak 26.6.3

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Referencias
https://access.redhat.com/errata/RHSA-2026:25097https://access.redhat.com/errata/RHSA-2026:25098https://access.redhat.com/security/cve/CVE-2026-9087https://bugzilla.redhat.com/show_bug.cgi?id=2480172