---
title: "CVE-2026-90800: Apache CouchDB - Broken Access Control"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-90800/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90800)

## 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](https://cwe.mitre.org/data/definitions/862.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90800](https://nvd.nist.gov/vuln/detail/CVE-2026-90800)
- [https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr](https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr)
- [http://www.openwall.com/lists/oss-security/2026/10/20/15](http://www.openwall.com/lists/oss-security/2026/10/20/15)
- [https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f](https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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