CVE-2026-88001

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

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

open-webui

CVSS v3.1 GITHUB

5.0 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

EPSS

0.38% chance of exploitation in the next 30 days, 30th percentile

Published

2026-09-09

Updated

2026-09-10

Proof-of-concept exploits (1)

• advisories/GHSA-5x7x-4c3c-qf5w

Security advisories

• open-webui/open-webui/security/advisories/GHSA-5x7x-4c3c-qf5w
• open-webui/open-webui/pull/27823

References

• CVE Record
• NVD entry