---
id: CVE-2026-9689
title: >-
  A flaw was found in Keycloak, an open-source identity and access management
  solution
summary: >-
  A flaw was found in Keycloak, an open-source identity and access management
  solution. When a client application is configured to accept broad redirect
  Uniform Resource Identifiers (URIs), a remote attacker can manipulate the
  authenticati…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-1288
vendor: redhat
product: build_of_keycloak
affected:
  - build_of_keycloak
published: '2026-05-27'
updated: '2026-08-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-9689'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:50846'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50847'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50848'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:50849'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-9689'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2481845'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00322
epssPercentile: 0.25445
ingestedAt: '2026-08-06T05:56:21.584Z'
---

## Overview

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

## Affected

- `build_of_keycloak`

## Remediation

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