{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.28.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "700821e1364eaab0e8f21c538a2131719fec57bf"
            }
          ],
          "repo": "https://github.com/comfy-org/comfyui",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-53g8-45wq-pcv8"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56672.json"
  },
  "details": "ComfyUI is a node-based diffusion model GUI, API, and backend. Prior to 0.28.0, GET /userdata/{file} served user-controlled HTML and SVG files with extension-derived content types, allowing stored cross-site scripting in the ComfyUI origin and access to browser-stored API tokens, settings, workflows, and authenticated-equivalent API calls. The handler used web.FileResponse(path), so an uploaded .html/.svg was served as text/html/image/svg+xml. POST /userdata stores arbitrary request bodies (confined to the user's userdata directory). When a victim navigated to the file URL, the embedded script executed same-origin. The /view endpoint already forced dangerous MIME types to download; that protection had never been applied to /userdata. This issue is fixed in version 0.28.0.",
  "id": "CVE-2026-56672",
  "modified": "2026-08-04T11:30:54.315731037Z",
  "published": "2026-07-31T04:27:18.721Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Comfy-Org/ComfyUI/releases/tag/v0.28.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56672.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Comfy-Org/ComfyUI/security/advisories/GHSA-53g8-45wq-pcv8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56672"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Comfy-Org/ComfyUI/commit/96e0e3585b41e1417442eaa14ec57f7b4ffcb5e0"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ComfyUI: Stored XSS via /userdata/{file} due to Missing Content-Type Sanitization"
}