CVE-2026-90800

critical

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.

References

https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr

https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105100

http://www.openwall.com/lists/oss-security/2026/10/20/15

Details

Source: Mitre, NVD

Published: 2026-10-20

Updated: 2026-10-20

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Severity: High

CVSS v4

Base Score: 9.4

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

Severity: Critical

EPSS

EPSS: 0.00632