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      <title>CVE-2026-44555 — Open WebUI: Base Model Routing Bypasses Access Control via Model Chaining</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-44555</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; open-webui&lt;/p&gt;
&lt;p&gt;Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI supports model composition via base_model_id: a user-defined model (e.g., &amp;#34;Cheap Assistant&amp;#34;) can reference an existing base model (e.g., &amp;#34;gpt-4-turbo-restricted&amp;#34;) that provides the actual inference capability. When a user queries the composed model, the access control pipeline verifies the user has access to the composed model but never re-verifies access to the chained base model. Additionally, the model creation and import endpoints accept arbitrary base_model_id values without checking that the caller has access to that base model. Combined, this allows any user with the default model creation permission to create a model that chains to a restricted base model — and then invoke it, causing the server to dispatch the request to the restricted base model using the admin-configured API key. This vulnerability is fixed in 0.9.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; open-webui&lt;/p&gt;
&lt;p&gt;Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI supports model composition via base_model_id: a user-defined model (e.g., &amp;#34;Cheap Assistant&amp;#34;) can reference an existing base model (e.g., &amp;#34;gpt-4-turbo-restricted&amp;#34;) that provides the actual inference capability. When a user queries the composed model, the access control pipeline verifies the user has access to the composed model but never re-verifies access to the chained base model. Additionally, the model creation and import endpoints accept arbitrary base_model_id values without checking that the caller has access to that base model. Combined, this allows any user with the default model creation permission to create a model that chains to a restricted base model — and then invoke it, causing the server to dispatch the request to the restricted base model using the admin-configured API key. This vulnerability is fixed in 0.9.0.&lt;/p&gt;</content:encoded>
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