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

Modified

AliasesGHSA-7rjh-px4v-5w55PYSEC-2026-2711

Published 15-05-2026Last modified 19-05-2026

Vulnerability summary

CVE-2026-44558 is a medium (CVSS 5.4) Missing Authorization vulnerability in open-webui. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk

32/100

0100

Medium · default modelHow is this calculated?

CVSS score

5.4/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.27%

0%100%

Low · +0.08 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1github

Timeline

15-05-2026
PublishedVulnerability first disclosed.
19-05-2026
Last modifiedVulnerability information updated.

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.