---
id: CVE-2026-90800
title: 'Apache CouchDB: Auth bypass in prefixed _users and _replicator databases'
summary: >-
  Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on
  all platforms allows any request to read the full contents of a prefixed _user
  or _replicator database via an unauthorised API endpoint.



  The use of prefixed sy…
severity: high
cvss: 8.1
cvssVector: >-
  CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
cvssSource: cna
vendor: Apache Software Foundation
product: Apache CouchDB
affected:
  - apache_couchdb < 3.5.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-20T16:57:29.708316Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T18:10:09.013Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-90800'
references:
  - url: 'https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f'
  - url: 'https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr'
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.297Z'
---

## Overview

Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint.


The use of prefixed system databases is very rare.

Users are recommended to upgrade to version 3.5.3, which fixes this issue.

## Affected

- `apache_couchdb < 3.5.3`

## Remediation

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