CVE-2026-44558 - Open WebUI: Channel Access Grants Bypass filter_allowed_access_grants

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MEDIUM

Open WebUI: Channel Access Grants Bypass filter_allowed_access_grants

Published May 15, 2026

5.4

MEDIUM

CVSS 3.1

EPSS 0.27%

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the channel router does not call filter_allowed_access_grants on either create or update paths. A non-admin user who can create group channels (or who owns a channel) can submit arbitrary access grants — including public wildcard grants — and those grants are stored verbatim, bypassing the admin's permission framework. 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 (2)

CWE-862

Missing Authorization

CWE-863

Incorrect Authorization

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30621
Advisory
https://github.com/advisories/GHSA-7rjh-px4v-5w55
Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-7rjh-px4v-5w55
exploitx_refsource_CONFIRMVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44558

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30621		Advisory
https://github.com/advisories/GHSA-7rjh-px4v-5w55		Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-7rjh-px4v-5w55		exploitx_refsource_CONFIRMVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44558