{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gtsteffaniak/filebrowser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260501184955-6bfc3974192e"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T03:29:43Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nFileBrowser Quantum serves inline SVG files without a `Content-Security-Policy` header, allowing embedded JavaScript in SVG files to execute when accessed via public share links.\n\nVerified on v1.3.0-stable.\n\n## Affected product\n\n- **Product:** FileBrowser Quantum (`gtsteffaniak/filebrowser`)\n- **Verified version:** v1.3.0-stable\n- **Docker image:** gtstef/filebrowser:latest\n- **Affected endpoint:** `GET /public/api/resources/download?hash=HASH\u0026inline=true`\n- **CWE:** CWE-79 \u2014 Cross-site Scripting (Stored)\n\n## Impact\n\n- **Stored XSS** \u2014 Malicious SVG persists and executes for every visitor to the share link\n- **No authentication required to trigger** \u2014 Public share links are accessible to anyone\n- **Session hijacking** \u2014 If authenticated users click the link, their session can be stolen\n- **Phishing** \u2014 Attacker can redirect or overlay fake login forms\n\n## Reproduction\n\n1. Login as any user with upload permission\n2. Upload SVG file:\n   ```xml\n   \u003csvg xmlns=\"http://www.w3.org/2000/svg\"\u003e\n     \u003cscript\u003ealert(document.domain)\u003c/script\u003e\n   \u003c/svg\u003e\n   ```\n3. Create public share for the file\n4. Access the share link with `?inline=true`\n5. JavaScript executes in browser\n\n## Root cause\n\nThe inline download endpoint returns SVG files with:\n```\nContent-Type: image/svg+xml\nContent-Disposition: inline; filename=\"xss.svg\"\nX-Content-Type-Options: nosniff\n```\n\nBut no CSP header to block script execution. The upstream project (filebrowser/filebrowser) mitigates this with:\n```\nContent-Security-Policy: script-src \u0027none\u0027\n```\n\n## Suggested fix\n\nAdd CSP header on inline file downloads:\n\n```go\nw.Header().Set(\"Content-Security-Policy\", \"script-src \u0027none\u0027\")\n```\n\nThis matches the upstream filebrowser/filebrowser implementation.",
  "id": "GHSA-mmpx-jh39-wrv6",
  "modified": "2026-05-07T03:29:43Z",
  "published": "2026-05-07T03:29:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-mmpx-jh39-wrv6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gtsteffaniak/filebrowser/commit/6bfc3974192e954f71cc5d1cd04baaaec3b76383"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gtsteffaniak/filebrowser"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FileBrowser Vulnerable to Stored XSS via SVG File in Public Share (Missing CSP Header)"
}