CVE-2026-9087

MEDIUM6.4

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

Published May 20, 2026

Modified 1 months ago

Details

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.

References

ADVISORY

https://access.redhat.com/errata/RHSA-2026:25097

ADVISORY

https://access.redhat.com/errata/RHSA-2026:25098

ADVISORY

https://access.redhat.com/errata/RHSA-2026:30049

ADVISORY

https://access.redhat.com/errata/RHSA-2026:30050

WEB

https://access.redhat.com/security/cve/CVE-2026-9087

WEB