CouchDB before 3.5.3 allows unauthenticated reads of prefixed system DBs
Missing checks in chttpd expose the full contents of prefixed _users or _replicator databases.
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Vulnerability2 · 1 read
CVE-2026-90800
Missing auth checks in Apache CouchDB prefixed system DBs
- CVSS 4.0
- 8.1 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
chttpd in Apache CouchDB 3.5.2 and earlier skips authorization checks, so any network request can read the full contents of a prefixed _user or _replicator database through an unauthorized API endpoint. No login or user interaction is required. The issue affects all platforms, but prefixed system databases are very rare.
What to do: Upgrade Apache CouchDB to 3.5.3, which fixes the missing authorization checks.
| Product | Affected | Fixed in |
|---|---|---|
| Apache CouchDB | 3.5.2 and below | 3.5.3 |
Estimated exposure
nicheunknown; prefixed system DBs are very rare — Apache states prefixed system databases are very rare; remote unauthenticated read.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
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.
- Weakness
- CWE-862
- 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:M/U:Amber