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

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 6.4EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Ciclo de vida

20 may 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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 26.4 Red Hat · Red Hat build of Keycloak 26.4.13 Red Hat · Red Hat build of Keycloak 26.6 Red Hat · Red Hat build of Keycloak 26.6.3

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Referencias

https://access.redhat.com/errata/RHSA-2026:25097 https://access.redhat.com/errata/RHSA-2026:25098 https://access.redhat.com/errata/RHSA-2026:30049 https://access.redhat.com/errata/RHSA-2026:30050 https://access.redhat.com/security/cve/CVE-2026-9087 https://bugzilla.redhat.com/show_bug.cgi?id=2480172