CVE-2026-90800 Apache CouchDB - Broken Access Control

Apache CouchDB <= 3.5.2 contains a broken access control vulnerability caused by missing authorization checks in chttpd, letting attackers read full contents of prefixed _user or _replicator databases via unauthorized API endpoints, exploit requires no special privileges.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure
CVSS 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
Published
20 October 2026
Updated
21 October 2026
Weakness
CWE-862

Vendor fix

Upgrade to version 3.5.3.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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