Keycloak vulnerable to authorization bypass via incorrect uri comparison

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS

• CVE-2026-9800: 0.65% estimated exploitation activity in the next 30 days; percentile 51.24 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

29 Oct 2026, 16:37 UTC

Last modified by the source

29 Oct 2026, 16:56 UTC

Source last checked

30 Oct 2026, 07:10 UTC

1. Revision 3 · amended · 30 Oct 2026

   Amended from osv record BIT-keycloak-2026-9800

2. Revision 2 · amended · 30 Oct 2026

   Amended from osv record GHSA-f5p5-6xmx-p252

3. Revision 1 · created · 29 Oct 2026

   Published from ghsa record GHSA-f5p5-6xmx-p252

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# Patch Next advisory brief: CVE-2026-9800

Advisory: Keycloak vulnerable to authorization bypass via incorrect uri comparison
IDs: CVE-2026-9800, GHSA-f5p5-6xmx-p252
Record: https://patchnext.com/advisories/cve-2026-9800 (revision 3, source checked 30 Oct 2026, 07:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.keycloak:keycloak-services 26.6.4; org.keycloak:keycloak-policy-enforcer 26.0.10; keycloak 26.7.0, 26.4.13. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.keycloak:keycloak-services: affected < 26.6.4; fixed in 26.6.4
- Maven org.keycloak:keycloak-policy-enforcer: affected < 26.0.10; fixed in 26.0.10
- Bitnami keycloak: affected >= 26.4.0, < 26.4.13; >= 26.6.0, < 26.7.0; fixed in 26.7.0, 26.4.13

## Suggested inspection (read-only)
- Maven org.keycloak:keycloak-services: check the installed version with your package manager.
- Maven org.keycloak:keycloak-policy-enforcer: check the installed version with your package manager.
- Bitnami keycloak: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.keycloak:keycloak-services, org.keycloak:keycloak-policy-enforcer, keycloak.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f5p5-6xmx-p252 (GitHub-reviewed advisory GHSA-f5p5-6xmx-p252 lists affected ranges: Maven org.keycloak:keycloak-services >=0 =0 <26.0.10)
- Verified: https://osv.dev/vulnerability/GHSA-f5p5-6xmx-p252 (OSV record GHSA-f5p5-6xmx-p252 lists affected ranges: Maven org.keycloak:keycloak-services >=0 =0 <26.0.10 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-keycloak-2026-9800 (OSV record BIT-keycloak-2026-9800 lists affected ranges: Bitnami keycloak >=26.4.0 =26.6.0 <26.7.0 (fixed))

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