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Advisory record · GHSA-5x7x-4c3c-qf5w

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

CVSS 5.0 MediumEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 9 Sept 2026, 23:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
open-webuiPyPI>=0.9.5, <0.11.10.11.1
Identifiers
GHSA-5x7x-4c3c-qf5w · CVE-2026-88001 · PYSEC-2026-3878
Weakness (CWE)
CWE-918
Tags
Published
9 Sept 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Open WebUI versions 0.9.5 up to but not including 0.11.1 are affected. When the AIOHTTP_CLIENT_ALLOW_REDIRECTS setting is enabled (it is off by default), an authenticated user can submit a URL that redirects, causing the server to fetch the redirect destination without the excluded-host list or private-address check applied, reaching internal addresses such as loopback and cloud metadata endpoints. Upgrade to Open WebUI 0.11.1. Operators who route outbound fetches through a forward proxy should also restrict destinations on the proxy itself.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.0 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.