Description
A flaw was found in the User Session Note mapper of the Keycloak identity and access management solution. The issue occurs because the mapper does not validate whether a requested session note contains sensitive internal credentials, such as federated access tokens from external identity providers. This allows a delegated client administrator to leak a user's upstream bearer tokens into the tokens issued to their managed application, potentially leading to unauthorized access to the user's data on external platforms.
Published: 2026-10-05
Score: 5.7 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

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History

Mon, 05 Oct 2026 06:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in the User Session Note mapper of the Keycloak identity and access management solution. The issue occurs because the mapper does not validate whether a requested session note contains sensitive internal credentials, such as federated access tokens from external identity providers. This allows a delegated client administrator to leak a user's upstream bearer tokens into the tokens issued to their managed application, potentially leading to unauthorized access to the user's data on external platforms.
Title Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access tokens
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-200
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'}


Subscriptions

Redhat Build Keycloak Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-05T05:51:58.125Z

Reserved: 2026-10-05T05:32:50.729Z

Link: CVE-2026-105302

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-05T06:16:58.383

Modified: 2026-10-05T06:16:58.383

Link: CVE-2026-105302

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-05T08:00:13Z

Weaknesses
  • CWE-200

    Exposure of Sensitive Information to an Unauthorized Actor