CVE-2026-9087

HighCVSS 8.1/10Last modified Jul 23, 2026

Description

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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-639

Affected software

No affected versions have been published.

Timeline

Published: May 20, 2026
Last modified: Jul 23, 2026
NVD status: Modified

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