CWE-283

Unverified Ownership

The product does not properly verify that a critical resource is owned by the proper entity.

CVE-2026-44562 (GCVE-0-2026-44562)

Vulnerability from cvelistv5 – Published: 2026-05-15 19:30 – Updated: 2026-05-15 22:21
VLAI
Title
Open WebUI: Model Import Overwrites Any Model Without Ownership Check
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the POST /api/v1/models/import endpoint allows users with the workspace.models_import 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, filter_allowed_access_grants is never called, bypassing the access grant restrictions enforced on all other model mutation endpoints. This vulnerability is fixed in 0.9.0.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
open-webui open-webui Affected: < 0.9.0
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Mitigation ID: MIT-1

Phases: Architecture and Design, Operation

Description:

  • Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
Mitigation ID: MIT-49

Phase: Architecture and Design

Strategy: Separation of Privilege

Description:

  • Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.

No CAPEC attack patterns related to this CWE.

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