Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M
CVE-2026-88001Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets
Medium 5.0
In plain English
A medium-severity server-side request forgery in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | open-webui | 0.11.1 | GHSA-5x7x-4c3c-qf5w |
| PyPI | open-webui | 0.11.1 | PYSEC-2026-3878 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | >= 0.9.5, < 0.11.1 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-5x7x-4c3c-qf5w x_refsource_CONFIRM
- https://github.com/open-webui/open-webui/pull/27823 x_refsource_MISC
- https://github.com/open-webui/open-webui/commit/e3e4bd87df6fc629e7e22081d980d55a7632b8b7 x_refsource_MISC
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1 x_refsource_MISC