CVE-2026-44559 - Open WebUI: Missing Access Check on Channel Members Endpoint for Standard Channels

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MEDIUM

Open WebUI: Missing Access Check on Channel Members Endpoint for Standard Channels

Published May 15, 2026

4.3

MEDIUM

CVSS 3.1

EPSS 0.30%

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.

Affected products

Vendor Open-Webui Product Open-Webui Default
n/a
- Version
  < 0.9.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Open-Webui

n/a

Version	Status	Constraints
< 0.9.0	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-862

Missing Authorization

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30617
Advisory
https://github.com/advisories/GHSA-c7wp-3qh5-55pv
Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv
exploitx_refsource_CONFIRMVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44559

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30617		Advisory
https://github.com/advisories/GHSA-c7wp-3qh5-55pv		Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv		exploitx_refsource_CONFIRMVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44559