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OpenAdvisories
Medium · 5.0 CVE-2026-88001 EUVD-2026-75187GHSA-5x7x-4c3c-qf5wPYSEC-2026-3878

Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets

Published Sep 9, 2026 · Updated Sep 10, 2026 · Assigned by GitHub_M

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, server-side web fetches did not reapply WEB_FETCH_FILTER_LIST or private-address controls to HTTP redirect destinations when AIOHTTP_CLIENT_ALLOW_REDIRECTS was enabled. An authenticated user could redirect the aiohttp and requests fetch paths to excluded hosts, loopback, private networks, or cloud metadata services and route resulting content into web search, URL ingestion, page-fetch tools, or chat image processing. This issue is fixed in version 0.11.1.

Affected products

VendorProductAffectedFixed
open-webui open-webui >= 0.9.5, < 0.11.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI open-webui >= 0.9.5, < 0.11.1 0.11.1 GHSA-5x7x-4c3c-qf5w

References