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
