Vulnerability Details CVE-2026-9087
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.7%
CVSS Severity
CVSS v3 Score 6.4
References
Products affected by CVE-2026-9087
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cpe:2.3:a:redhat:build_of_keycloak:-