CVE-2026-45402

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{"affected": [{"affectedData": [{"product": "open-webui", "vendor": "open-webui", "versions": [{"status": "affected", "version": "< 0.9.5"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*", "matchCriteriaId": "19F64B41-71DA-4E31-A040-1C351A537567", "versionEndExcluding": "0.9.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, multiple endpoints accept a user-supplied file_id and attach the referenced file to a resource the caller controls (folder knowledge, knowledge-base contents) without verifying that the caller owns or has been granted access to the file. The file's content then becomes reachable through the downstream RAG / file-content paths, allowing any authenticated user to exfiltrate any other user's private file \u2014 and on the knowledge-base path, also to overwrite it \u2014 given knowledge of the file's UUID. This affects backend/open_webui/routers/folders.py (POST /api/v1/folders/{id}/update), backend/open_webui/routers/knowledge.py (add_file_to_knowledge_by_id), and backend/open_webui/routers/knowledge.py (add_files_to_knowledge_by_id_batch). This vulnerability is fixed in 0.9.5."}, {"lang": "es", "value": "Open WebUI es una plataforma de inteligencia artificial autoalojada dise\u00f1ada para operar completamente sin conexi\u00f3n. Antes de 0.9.5, m\u00faltiples puntos finales aceptan un file_id proporcionado por el usuario y adjuntan el archivo referenciado a un recurso que el llamador controla (conocimiento de carpetas, contenidos de la base de conocimiento) sin verificar que el llamador posee o se le ha concedido acceso al archivo. El contenido del archivo se vuelve entonces accesible a trav\u00e9s de las rutas descendentes RAG / contenido de archivo, permitiendo a cualquier usuario autenticado exfiltrar el archivo privado de cualquier otro usuario - y en la ruta de la base de conocimiento, tambi\u00e9n sobrescribirlo - dado el conocimiento del UUID del archivo. Esto afecta a backend/open_webui/routers/folders.py (POST /API/v1/folders/{id}/update), backend/open_webui/routers/knowledge.py (add_file_to_knowledge_by_id), y backend/open_webui/routers/knowledge.py (add_files_to_knowledge_by_id_batch). Esta vulnerabilidad se corrige en 0.9.5."}], "id": "CVE-2026-45402", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45402", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-18T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-05-15T21:16:38.273", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-r472-mw7m-967f"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-r472-mw7m-967f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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