CVE-2026-90800CWE-862broken-access-control

CVE-2026-90800

published October 20, 2026

CVSS
8.1
EPSS
1%
Percentile
49.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.1 · NONE
CVSS v4.0
8.1 · 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
EPSS
0.00632 · 49.7th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-10-20T20:17Z
References (3)
https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f · [email protected]https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr · [email protected]http://www.openwall.com/lists/oss-security/2026/10/20/15 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 22 OCT 03:36Z
    EPSS moved — → 1%
    epss
  • 20 OCT 15:40Z
    Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
    cvelistv5
  • 20 OCT 15:40Z
    Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
    cvelistv5