CVE-2026-9087

HIGH EPSS 22.9%

Published May 20, 20261mo ago · Modified Jun 17, 20261w ago

8.1 CVSS 3.1

High

Published May 20, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

8.1

Exploitability

2.8

Impact

5.2

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction Required

Scope Unchanged

Confidentiality High

Integrity High

Availability None

Threat Intelligence

EPSS Exploit Probability

22.9% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-639

Affected Products 1

Vendor	Product	Version	Range
redhat	build_of_keycloak	*	any

References 4

access.redhat.com https://access.redhat.com/errata/RHSA-2026:25097
access.redhat.com https://access.redhat.com/errata/RHSA-2026:25098
access.redhat.com https://access.redhat.com/security/cve/CVE-2026-9087

Vendor Advisory
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2480172

Issue TrackingVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.