Open WebUI: Model Import Overwrites Any Model Without Ownership Check
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44562
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 17:21 UTC · Revision 1
Source evidence
Open WebUI: Model Import Overwrites Any Model Without Ownership Check
core-osv · Original sourcePublished 15 May 2026, 19:30 UTC
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.
osv:CVE-2026-44562
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-44562",
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"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.",
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"modified": "2026-10-28T02:30:21.526507131Z",
"provider": "osv",
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"source_id": "core-osv",
"document_id": 487685,
"published_at": "2026-05-15T19:30:40.838+00:00"
}