CVE-2026-90800 PUBLISHED

Apache CouchDB: Auth bypass in prefixed _users and _replicator databases

Assigner: apache
Reserved: 13.09.2026 Published: 20.10.2026 Updated: 20.10.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 8.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Apache Software Foundation
Product	Apache CouchDB
Versions	Default: unaffected affected from 0 to 3.5.3 (excl.)

Credits

Qing Xu & ZeroVuln Labs reported this issue independently reporter

CVE-2026-90800 PUBLISHED

Apache CouchDB: Auth bypass in prefixed _users and _replicator databases

Metrics

Product Status

Credits

References