---
id: "CVE-2026-9800"
kind: "vulnerability"
aliases: ["CVE-2026-9800", "GHSA-f5p5-6xmx-p252"]
title: "Keycloak vulnerable to authorization bypass via incorrect uri comparison"
severity: "high"
cvss: 8.1
epss: 0.00651
exploited: false
status: "open"
category: "package"
products: [{"name": "org.keycloak:keycloak-services", "fixed": ["26.6.4"], "affected": "< 26.6.4", "ecosystem": "maven"}, {"name": "org.keycloak:keycloak-policy-enforcer", "fixed": ["26.0.10"], "affected": "< 26.0.10", "ecosystem": "maven"}, {"name": "redhat build of keycloak", "fixed": ["26.4.13"], "affected": ">= 26.4, < 26.4.13", "ecosystem": "vendor"}, {"name": "redhat build of keycloak", "fixed": [], "affected": ">= 26.6, <= 26.6.4", "ecosystem": "vendor"}]
ecosystems: ["maven", "vendor"]
tags: ["authorization", "cwe-1025", "java", "keycloak", "package", "self-hosted"]
not_affected_if: ["auth-required-not-true", "no-policy-enforcer"]
published_at: "2026-06-25T17:17:04+00:00"
first_seen_at: "2026-10-29T16:39:02+00:00"
updated_at: "2026-10-29T16:56:32+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-f5p5-6xmx-p252", "first_seen_at": "2026-10-29T16:39:02+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9800", "first_seen_at": "2026-10-29T16:56:32+00:00"}]
---

# Keycloak vulnerable to authorization bypass via incorrect uri comparison

Keycloak Policy Enforcer compares request URIs incorrectly, so any logged-in user can include the configured access-denied page path in a request and skip role, scope and UMA permission checks. An attacker who already has a valid account can reach protected resources they should not see.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- maven:org.keycloak:keycloak-services affected < 26.6.4 fixed 26.6.4
- maven:org.keycloak:keycloak-policy-enforcer affected < 26.0.10 fixed 26.0.10
- vendor:redhat build of keycloak affected >= 26.4, < 26.4.13 fixed 26.4.13
- vendor:redhat build of keycloak affected >= 26.6, <= 26.6.4 fixed ?

## How to check

- Check the Maven dependencies for `org.keycloak:keycloak-services` and `org.keycloak:keycloak-policy-enforcer` and compare against the fixed versions below.
- Look for the Policy Enforcer configuration and whether an access-denied page path is set (unknown if the sources give a file or setting name).

## Fix

- `keycloak-services`: upgrade to `26.6.4` or later
- `keycloak-policy-enforcer`: upgrade to `26.0.10` or later

## Timeline

- 2026-10-29T16:39:02+00:00 ghsa https://github.com/advisories/GHSA-f5p5-6xmx-p252
- 2026-10-29T16:56:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-9800

## Documents

- [advisory] Maintainer's advisory: api.github.com https://api.github.com/repos/keycloak/keycloak/security-advisories/GHSA-f5p5-6xmx-p252
- [advisory] Maintainer's advisory: github.com https://github.com/keycloak/keycloak/security/advisories/GHSA-f5p5-6xmx-p252
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30049
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30050
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30083
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30084
- [advisory] Vendor advisory: access.redhat.com https://access.redhat.com/security/cve/CVE-2026-9800
- [advisory] Vendor advisory: bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2482472
- [advisory] Vendor advisory: security.access.redhat.com https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9800.json

## From the sources

### Description
A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_