{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.5.0b3.dev99"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45306"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-706"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-14T20:17:27Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\nThe fix for CVE-2026-33509 prevents setting `storage_folder` inside `PKGDIR` or `userdir`, but does NOT protect the Flask session directory (`/tmp/pyLoad/flask`). An authenticated attacker can set `storage_folder` to the session directory and download session files of other users via `/files/get/`, leading to account takeover.\n\n## Details\n\nThe fix in `src/pyload/core/api/__init__.py`:\n\n```python\ndirectories = [PKGDIR, userdir]\nif any(directories[0].startswith(d) for d in directories[1:]):\n    return  # blocked\n```\n\nBut the Flask session directory is:\n```python\nsession_storage_path = os.path.join(api.get_cachedir(), \"flask\")\n# = /tmp/pyLoad/flask  \u2190 NOT blocked by fix\n```\n\n## Attack Chain\n\n1. Attacker (admin) sets `storage_folder = /tmp/pyLoad/flask`\n2. Fix does NOT block this \u2014 `/tmp/pyLoad/flask` not inside `PKGDIR` or `userdir`\n3. Attacker requests `GET /files/get/\u003cvictim_session_filename\u003e`\n4. `send_from_directory(\u0027/tmp/pyLoad/flask\u0027, session_file)` serves victim\u0027s session\n5. Attacker uses stolen session \u2192 **Account Takeover**\n\n## PoC\n\n\u003cimg width=\"592\" height=\"408\" alt=\"POC\" src=\"https://github.com/user-attachments/assets/936b9f56-325b-437d-9edd-e0d5bb995187\" /\u003e\n\n```python\nimport os\n\nPKGDIR = \"/usr/lib/python3/dist-packages/pyload\"\nuserdir = os.path.expanduser(\"~/.pyload\")\nsession_dir = \"/tmp/pyLoad/flask\"\n\ncorrect_case = lambda x: x\ndirectories = [\n    correct_case(os.path.join(os.path.realpath(d), \"\"))\n    for d in [session_dir, PKGDIR, userdir]\n]\nblocked = any(directories[0].startswith(d) for d in directories[1:])\n\nprint(f\"Fix blocks session_dir: {blocked}\")\n# Output: Fix blocks session_dir: False  \u2190 BYPASS CONFIRMED\n```\n\n## Impact\nAuthenticated admin can steal sessions of other users \u2192 Account Takeover.\n\n## Suggested Fix\n```python\nblocked_dirs = [PKGDIR, userdir, api.get_cachedir()]\ndirectories = [\n    os.path.join(os.path.realpath(d), \"\")\n    for d in [value] + blocked_dirs\n]\nif any(directories[0].startswith(d) for d in directories[1:]):\n    return\n```",
  "id": "GHSA-w727-595x-pc3r",
  "modified": "2026-05-14T20:17:28Z",
  "published": "2026-05-14T20:17:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-w727-595x-pc3r"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-r7mc-x6x7-cqxx"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad Has Incomplete Fix for CVE-2026-33509 -storage_folder Bypass via Session Directory in pyLoad"
}