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VULNERABILITIES

CVE-2026-97174 Details

Description

A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIBA endpoint fails to properly validate the sub parameter, allowing it to be stored as an additional request parameter. During the token issuance process, this injected value overwrites the legitimate subject identifier. This allows an attacker to authenticate as themselves but receive security tokens belonging to a different victim user, leading to unauthorized account access.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:95761 [email protected]
https://access.redhat.com/errata/RHSA-2026:95762 [email protected]
https://access.redhat.com/security/cve/CVE-2026-97174 [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2539961 [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-20Improper Input Validation[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-97174
NVD Published Date:
Nov 5, 2026
NVD Last Modified:
Nov 6, 2026
Source:
[email protected]