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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History
Fri, 15 May 2026 23:15:00 +0000
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ssvc
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Fri, 15 May 2026 21:45:00 +0000
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Open-webui
Open-webui open-webui |
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Open-webui
Open-webui open-webui |
Fri, 15 May 2026 20:15:00 +0000
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| Description | 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. | |
| Title | Open WebUI: Model Import Overwrites Any Model Without Ownership Check | |
| Weaknesses | CWE-283 CWE-862 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-15T19:30:40.838Z
Updated: 2026-05-15T22:21:49.822Z
Reserved: 2026-05-06T20:59:00.595Z
Link: CVE-2026-44562
Updated: 2026-05-15T22:14:45.846Z
Status : Received
Published: 2026-05-15T20:16:47.873
Modified: 2026-05-15T20:16:47.873
Link: CVE-2026-44562
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