Open WebUI's Model Import Overwrites Any Model Without Ownership Check

Exploitation

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

CVSS

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

EPSS

• CVE-2026-44562: 0.29% estimated exploitation activity in the next 30 days; percentile 21.67 (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.

Model Import Overwrites Any Model Without Ownership Check Affected Component Model import endpoint: - backend/openwebui/routers/models.py (lines 254-308, importmodels) Affected Versions Current main branch (commit 6fdd19bf1) and likely all versions with model import functionality. Description The POST /api/v1/models/import endpoint allows users with the workspace.modelsimport permission to overwrite any existing model in the database, regardless of ownership. When an imported model's ID matches an existing model, the endpoint merges the attacker's payload over the existing model data and writes it to the database with no ownership or access grant validation. Additionally, filterallowedaccessgrants is never called, bypassing the access grant restrictions enforced on all other model mutation endpoints. Compare with properly-guarded endpoints: - updatemodelbyid (line 499): checks ownership/write access AND calls filterallowedaccessgrants - updatemodelaccessbyid (line 571): checks…

Published by the source

8 May 2026, 19:52 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-mqq6-cqcx-38vg

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-mqq6-cqcx-38vg

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# Patch Next advisory brief: CVE-2026-44562

Advisory: Open WebUI's Model Import Overwrites Any Model Without Ownership Check
IDs: CVE-2026-44562, GHSA-mqq6-cqcx-38vg
Record: https://patchnext.com/advisories/cve-2026-44562 (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 6.5)
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-mqq6-cqcx-38vg (OSV record GHSA-mqq6-cqcx-38vg lists affected ranges: PyPI open-webui >=0 <0.9.0 (fixed))
- Verified: https://github.com/advisories/GHSA-mqq6-cqcx-38vg (GitHub-reviewed advisory GHSA-mqq6-cqcx-38vg lists affected ranges: PyPI open-webui >=0 <=0.8.12)

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