High 8.1Published Oct 20, 2026

CVE-2026-90800Apache CouchDB: Auth bypass in prefixed _users and _replicator databases

Updated under an hour ago (Oct 27, 2026, 2:40 AM ET)

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It affects Apache Software Foundation Apache CouchDB. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.63%, higher than 50% of scored CVEs.

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Every CVE for Apache Software Foundation Apache CouchDB

Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.63% (percentile 50)
Assigned by: apache
NVD analysis: Deferred
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 20, 2026

Affected products

Affected products

Apache Software Foundation Apache CouchDB apache_software_foundation:apache_couchdb (from the name)	before 3.5.3	CNA record

References

References

https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f	release-notes
https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/10/20/15

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.