{"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.\n\n\nThe 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","slug":"CVE-2026-90800","body":"## Overview\n\nMissing 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.\n\n\nThe use of prefixed system databases is very rare.\n\nUsers are recommended to upgrade to version 3.5.3, which fixes this issue.\n\n## Affected\n\n- `apache_couchdb < 3.5.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}