---
id: CVE-2026-97848
title: >-
  Keycloak-services: keycloak-services: protocol mapper with jsontype=json
  bypasses token sanitization
summary: >-
  A flaw was found in the token sanitization logic of Keycloak, an open source
  identity and access management solution. The issue occurs when a protocol
  mapper is configured to emit structured claims using the JSON type. The
  security check…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-20
vendor: Red Hat
product: keycloak-rhel9-container
affected:
  - keycloak-rhel9-container (all versions)
  - keycloak-rhel9-operator-bundle-container (all versions)
  - keycloak-rhel9-operator-container (all versions)
  - keycloak-services
  - rhbk/keycloak-rhel9
  - keycloak-services
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T10:27:54.142Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-97848'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:95760'
    label: 'RHSA-2026:95760'
  - url: 'https://access.redhat.com/errata/RHSA-2026:95761'
    label: 'RHSA-2026:95761'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97848'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540960'
    label: RHBZ#2540960
tags:
  - cve.org
ingestedAt: '2026-11-06T06:46:27.263Z'
---

## Overview

A flaw was found in the token sanitization logic of Keycloak, an open source identity and access management solution. The issue occurs when a protocol mapper is configured to emit structured claims using the JSON type. The security check designed to remove unauthorized role mappings only looks for standard Java maps and fails to recognize Jackson based JSON objects. This allows an attacker to inject forged client roles into security tokens, which could lead to unauthorized access to protected resources.

## Affected

- `keycloak-rhel9-container (all versions)`
- `keycloak-rhel9-operator-bundle-container (all versions)`
- `keycloak-rhel9-operator-container (all versions)`
- `keycloak-services`
- `rhbk/keycloak-rhel9`
- `keycloak-services`

## Remediation

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

### Workarounds

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.