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Message-Id: <2416DBE6-C1A7-41B9-9E89-8325C1687437@apache.org>
Date: Tue, 20 Oct 2026 14:31:06 +0200
From: Jan Lehnardt <jan@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-90800: Apache CouchDB: Auth bypass in prefixed _users and
_replicator databases
Severity:
CVSS 4.0: 8.1 (high) 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
Affected versions:
- Apache CouchDB before 3.5.3
Description:
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.
Credit:
Qing Xu & ZeroVuln Labs reported this issue independently (reporter)
References:
https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f
https://couchdb.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-90800
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