.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
.. use this file except in compliance with the License. You may obtain a copy of
.. the License at
..
..   http://www.apache.org/licenses/LICENSE-2.0
..
.. Unless required by applicable law or agreed to in writing, software
.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
.. License for the specific language governing permissions and limitations under
.. the License.

.. _cve/2026-90800:

===========================
CVE-2026-90800: |longtitle|
===========================

.. |longtitle| replace:: Auth bypass in prefixed Apache CouchDB ``_users`` and
    ``_replicator`` databases

:Date: 12.10.2026

:Affected: 3.5.2 and below

:Severity: High

:Vendor: The Apache Software Foundation

Description
===========

CouchDB supports multiple instances of the system databases ``_users`` and
``_replicator``. They are differentiated with a prefix, for example
``/foo/_users`` or ``/bar/_replicator``. These databases behave exactly like
the base system databases, but allow bespoke access control for their contents.

The restriction of allowing only server and database admins to use the
``_all_docs`` and ``_changes`` API endpoints on those prefixed system databases
was not enforced.

Mitigation
==========

The admin-only restriction is now enforced.

Workarounds
===========

N/A

Credit
======

Qing Xu & ZeroVuln Labs reported this issue independently.