---
id: CVE-2026-9799
aliases:
  - GHSA-w3p3-7cjg-vgfw
title: >-
  Keycloak allows unauthorized access to resources via uma permission ticket
  bypass
summary: >-
  Keycloak allows unauthorized access to resources via uma permission ticket
  bypass
severity: medium
cvss: 4.6
cwe:
  - CWE-639
vendor: keycloak
product: 'org.keycloak:keycloak-services'
ecosystem: maven
affected:
  - 'org.keycloak:keycloak-services < 26.6.4'
patched:
  - 'org.keycloak:keycloak-services 26.6.4'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T16:37:59Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-w3p3-7cjg-vgfw'
references:
  - url: >-
      https://github.com/keycloak/keycloak/security/advisories/GHSA-w3p3-7cjg-vgfw
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-9799'
  - url: 'https://access.redhat.com/errata/RHSA-2026:30049'
  - url: 'https://access.redhat.com/errata/RHSA-2026:30050'
  - url: 'https://access.redhat.com/errata/RHSA-2026:30083'
  - url: 'https://access.redhat.com/errata/RHSA-2026:30084'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-9799'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2482471'
  - url: 'https://github.com/advisories/GHSA-w3p3-7cjg-vgfw'
tags:
  - ghsa
  - maven
epss: 0.00294
epssPercentile: 0.21979
ingestedAt: '2026-10-29T17:39:38.165Z'
---

## Overview

### Description
A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.

## Affected packages

- `org.keycloak:keycloak-services < 26.6.4`

## Remediation

Upgrade to a patched release:

- `org.keycloak:keycloak-services 26.6.4`