Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.1 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

EPSS

• CVE-2026-87999: 0.36% estimated exploitation activity in the next 30 days; percentile 29.83 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Open WebUI fetches user-supplied URLs on the server for RAG URL ingestion and web search, and screens the resolved addresses so internal destinations cannot be reached. That screen decided whether a destination was external by asking Python's standard library whether the address is globally routable. Several addresses reserved for internal use answer yes to that question, including 168.63.129.16, the Azure platform channel every Azure virtual machine can reach. Any authenticated user could therefore make the server issue requests to those addresses and read the responses back through the API. Preconditions - The affected paths are the server-side URL fetches: RAG URL ingestion and web search. Both require an authenticated, verified account. No administrator role and no special workspace permission are needed. - ENABLELOCALWEBFETCH must be at its default of false. Setting it to true disables the address screen by design, and internal destinations are reachable on purpose. -…

Published by the source

10 Sep 2026, 15:09 UTC

Last modified by the source

1 Oct 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:51 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-34r3-9m95-vq73

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-34r3-9m95-vq73

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-34r3-9m95-vq73

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# Patch Next advisory brief: CVE-2026-87999

Advisory: Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch
IDs: CVE-2026-87999, GHSA-34r3-9m95-vq73
Record: https://patchnext.com/advisories/cve-2026-87999 (revision 3, source checked 26 Oct 2026, 13:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.11.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.11.1; fixed in 0.11.1

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-34r3-9m95-vq73 (GitHub-reviewed advisory GHSA-34r3-9m95-vq73 lists affected ranges: PyPI open-webui >=0 <0.11.1)
- Verified: https://osv.dev/vulnerability/GHSA-34r3-9m95-vq73 (OSV record GHSA-34r3-9m95-vq73 lists affected ranges: PyPI open-webui >=0 <0.11.1 (fixed))

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