CVE & CISA-KEV Catalog

CVE-2026-44559

MEDIUM
4.3
CVSS v3
NVD

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the GET /api/v1/channels/{id}/members endpoint only checks membership for group and dm channel types (lines 467-469). For standard channels — including private ones — there is no channel_has_access check before returning the member list. Any authenticated user who knows a private channel's UUID can enumerate all users with access to that channel. This vulnerability is fixed in 0.9.0.

CWE-862Missing Authorization

How to fix

Remediation Available
open webuiNVD
Affected:< 0.9.0Fixed in:0.9.0CVE-2026-44559derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.22%probability of exploitation in 30 days
13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Exploit1

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-39226Critical9.8100%KEVFix
CVE-2022-0543Critical10.0100%KEVFix
CVE-2021-21978Critical9.899%-Fix
CVE-2023-52163High8.896%KEV-
CVE-2022-1329High8.893%--
CVE-2023-6875Critical9.890%--
Embed a live status badge for CVE-2026-44559
CVE-2026-44559 severity badge

Markdown

[![CVE-2026-44559](https://tridentstack.com/cve/badge/CVE-2026-44559.svg)](https://tridentstack.com/cve/CVE-2026-44559)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-44559"><img src="https://tridentstack.com/cve/badge/CVE-2026-44559.svg" alt="CVE-2026-44559"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-19.