CVE-2026-90800

Apache CouchDB: Auth bypass in prefixed _users and _replicator databases

Published Oct 20, 2026 CVSS 4.0 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Apache
Apache couchdb
Vendors & Products Apache
Apache couchdb
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses CWE-862
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
References
Metrics cvssV4_0

{'score': 8.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Oct 20, 2026, 6:10 PM
Reserved
Sep 13, 2026, 3:07 PM
Status
Deferred
Published
Oct 20, 2026, 4:17 PM
Modified
Oct 20, 2026, 7:34 PM