CVE-2026-88001 Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets
Authenticated users can bypass fetch filters via HTTP redirects to access internal networks and cloud metadata in Open WebUI.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-88001?
CVE-2026-88001 is a medium-severity server-side request forgery vulnerability in Openwebui Open Webui, published on 9 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-88001?
3 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | From 0.9.5 | 0.11.1 |
open-webui PyPI | From 0.9.5 | 0.11.1 |
open-webui PyPI | From 0.9.5 | 0.11.1 |
Products include Openwebui Open Webui.
How do I fix CVE-2026-88001?
Upgrade open-webui to 0.11.1 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-88001 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88001 exists.
Other vulnerabilities in Openwebui Open Webui
- CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass
- CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
- CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui
- CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
- CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Sources
Also known as GHSA-5x7x-4c3c-qf5w, PYSEC-2026-3878.