---
id: CVE-2026-16089
title: >-
  A flaw was found in the keycloak-services component of Red Hat Build of
  Keycloak
summary: >-
  A flaw was found in the keycloak-services component of Red Hat Build of
  Keycloak. The issue occurs because OAuth 2.0 authorization codes are not
  properly bound to the client that originally requested them. An attacker who
  can intercept a…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N'
cwe:
  - CWE-472
  - CWE-384
vendor: redhat
product: build_of_keycloak
affected:
  - build_of_keycloak
patched:
  - build_of_keycloak 26.6.7
published: '2026-07-17'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:07.217'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16089'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:68277'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:68278'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-16089'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2501724'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16089.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-16089'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16089'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00295
epssPercentile: 0.19705
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-22T18:19:51.675300Z'
ingestedAt: '2026-08-09T15:33:36.402Z'
---

## Overview

A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.

## Affected

- `build_of_keycloak`

## Remediation

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

## Vendor advisories

- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)
- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)