CVE-2026-90800

Apache CouchDB: Auth bypass in prefixed _users and _replicator databases

HIGH
8.1
CVSS Score
Published: October 20, 2026 at 03:40 PM UTC
Updated: October 20, 2026 at 07:34 PM UTC
1 product affected across 1 vendorCouchdb

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Severity
HIGH8.1
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHapache
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-862

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