CVE-2026-9087

medium Red Hat
CVSS v3 Base Score
6.4
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Published: May 20, 2026 (50 days ago)
Last Modified: May 20, 2026
Vendor: Red Hat
Source: REDHAT

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.

CWE

CWE-639

Affected Products

Red Hat Build of Keycloak

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov