PT-2026-42199 · Red Hat · Red Hat Build Of Keycloak

Published 2026-05-20 · Updated 2026-05-20 · CVE-2026-9087

NVD

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Fix

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

CVE-2026-9087

Affected Products

Red Hat Build Of Keycloak

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-9087 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2480172 · Note
• https://access.redhat.com/security/cve/CVE-2026-9087 · Note