FKIE_CVE-2026-45402

Vulnerability from fkie_nvd - Published: 2026-05-15 21:16 - Updated: 2026-05-18 19:53
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
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 — and on the knowledge-base path, also to overwrite it — 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.
References
security-advisories@github.comhttps://github.com/open-webui/open-webui/security/advisories/GHSA-r472-mw7m-967fExploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/open-webui/open-webui/security/advisories/GHSA-r472-mw7m-967fExploit, Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
openwebui open_webui *
To clipboard 

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              "criteria": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "0.9.5",
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  "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\u0027s content then becomes reachable through the downstream RAG / file-content paths, allowing any authenticated user to exfiltrate any other user\u0027s private file \u2014 and on the knowledge-base path, also to overwrite it \u2014 given knowledge of the file\u0027s 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."
    }
  ],
  "id": "CVE-2026-45402",
  "lastModified": "2026-05-18T19:53:25.020",
  "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",
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        "type": "Secondary"
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  "published": "2026-05-15T21:16:38.273",
  "references": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-639"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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