---
id: CVE-2026-117859
title: 'Keycloak-services: keycloak-services: par single-use bypass via flow restart'
summary: >-
  A flaw was found in the Pushed Authorization Request PAR implementation of the
  keycloak-services component. The issue occurs when an authentication flow is
  restarted, which incorrectly clears the internal markers used to track PAR
  consum…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-670
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T15:30:08.711098Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T17:20:26.217Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117859'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-117859'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2561991'
    label: RHBZ#2561991
tags:
  - cve.org
epss: 0.00193
epssPercentile: 0.09096
ingestedAt: '2026-11-01T22:02:40.987Z'
---

## Overview

A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. The issue occurs when an authentication flow is restarted, which incorrectly clears the internal markers used to track PAR consumption while leaving the request active. This allows an attacker to reuse the same authorization request to obtain multiple access tokens, bypassing security requirements for single-use requests.

## Affected

- `keycloak-services (all versions)`
- `rhbk/keycloak-rhel9 (all versions)`
- `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.