---
id: CVE-2026-93999
title: >-
  A flaw was found in the OIDC protocol implementation of Keycloak, an
  open-source identity and access management solution
summary: >-
  A flaw was found in the OIDC protocol implementation of Keycloak, an
  open-source identity and access management solution. The issue occurs during
  the token refresh process when the server restores requested audiences from
  stored client I…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-862
vendor: Red Hat
product: keycloak/rhbk-openshift-rhel9
affected:
  - keycloak/rhbk-openshift-rhel9 (all versions)
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-09-19'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:37:36.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93999'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93999'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2537165'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93999.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93999'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93999'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00227
epssPercentile: 0.12055
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T15:57:36.224926Z'
ingestedAt: '2026-09-19T15:04:31.135Z'
---

## Overview

A flaw was found in the OIDC protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs during the token refresh process when the server restores requested audiences from stored client IDs. Keycloak fails to verify if the target audience client is still enabled before issuing a new access token. This allows an application with an existing refresh token to continue obtaining valid access tokens for a disabled client, potentially bypassing administrative access controls for resource servers that rely on offline JWT validation.

## 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 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93999.json)