Open WebUI's Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show

Exploitation

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

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

EPSS

• CVE-2026-44563: 0.24% estimated exploitation activity in the next 30 days; percentile 14.89 (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.

Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show Affected Component Ollama proxy endpoints missing model access control: - backend/openwebui/routers/ollama.py (lines 955-995, generatecompletion) - backend/openwebui/routers/ollama.py (lines 835-881, embed) - backend/openwebui/routers/ollama.py (lines 891-937, embeddings) - backend/openwebui/routers/ollama.py (lines 791-820, showmodelinfo) Affected Versions Current main branch (commit 6fdd19bf1) and likely all versions with Ollama model access control support. Description Four Ollama proxy endpoints accept any model name from the user and forward the request to the Ollama backend without checking whether the user is authorized to access that model. These endpoints only require getverifieduser (any authenticated non-pending user) and validate that the model exists in the full unfiltered model list, but never check AccessGrants.hasaccess(). This is in direct contrast with the…

Published by the source

8 May 2026, 19:52 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-rcvp-6fgw-c7fh

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-rcvp-6fgw-c7fh

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# Patch Next advisory brief: CVE-2026-44563

Advisory: Open WebUI's Ollama Model Access Control Bypass via /api/generate, /api/embed, /api/embeddings, and /api/show
IDs: CVE-2026-44563, GHSA-rcvp-6fgw-c7fh
Record: https://patchnext.com/advisories/cve-2026-44563 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.9.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.8.12; fixed in 0.9.0

## 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://osv.dev/vulnerability/GHSA-rcvp-6fgw-c7fh (OSV record GHSA-rcvp-6fgw-c7fh lists affected ranges: PyPI open-webui >=0 <0.9.0 (fixed))
- Verified: https://github.com/advisories/GHSA-rcvp-6fgw-c7fh (GitHub-reviewed advisory GHSA-rcvp-6fgw-c7fh lists affected ranges: PyPI open-webui >=0 <=0.8.12)

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