---
id: CVE-2026-105302
title: >-
  A flaw was found in the User Session Note mapper of the Keycloak identity and
  access management solution
summary: >-
  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, suc…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T06:16:58.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105302'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-105302'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2545800'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-105302.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-105302'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105302'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-10-05T06:13:49.198Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Build of Keycloak · no fix planned: Red Hat Build of Keycloak · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-105302.json)