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PYSEC-2026-1817

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:25
VLAI
Details

Summary

Open redirect vulnerability due to incorrect validation of input values when redirecting users after login.

Details

pyload is validating URLs via the get_redirect_url function when redirecting users at login. 301715649-f533db41-d0bd-44f7-8735-be1887fbd06c

The URL entered in the next variable goes through the is_safe_url function, where a lack of validation can redirect the user to an arbitrary domain. 301715667-2819b1d3-8a14-42f4-89c8-3d2fa84fc309

The documentation in the urllib library shows that improper URLs are recognized as relative paths when using the urlparse function. (https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlparse)

For example, When an unusual URL like https:///example.com is entered, urlparse interprets it as a relative path, but in the actual request it is converted to https://example.com due to url normalization.

PoC

  1. In the next variable, insert the URL to which you want to redirect the user. 301715949-bb1451eb-5e84-451d-83b4-5c3e204d1df7

  2. Check that it is possible to bypass url validation and redirect users to an arbitrary url. 301715824-3de6584a-878d-4ec4-a3d5-a34d11c6c0ac 301716107-ba5ab7b9-7aa8-4b7a-8924-eba82442b4c3

Impact

An attacker can use this vulnerability to redirect users to malicious websites, which can be used for phishing and similar attacks.

Impacted products
Name purl
pyload-ng pkg:pypi/pyload-ng

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng",
        "purl": "pkg:pypi/pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.0b3.dev79"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.0a5.dev528",
        "0.5.0a5.dev532",
        "0.5.0a5.dev535",
        "0.5.0a5.dev536",
        "0.5.0a5.dev537",
        "0.5.0a5.dev539",
        "0.5.0a5.dev540",
        "0.5.0a5.dev545",
        "0.5.0a5.dev562",
        "0.5.0a5.dev564",
        "0.5.0a5.dev565",
        "0.5.0a6.dev570",
        "0.5.0a6.dev578",
        "0.5.0a6.dev587",
        "0.5.0a7.dev596",
        "0.5.0a8.dev602",
        "0.5.0a9.dev615",
        "0.5.0a9.dev629",
        "0.5.0a9.dev632",
        "0.5.0a9.dev641",
        "0.5.0a9.dev643",
        "0.5.0a9.dev655",
        "0.5.0a9.dev806",
        "0.5.0b1.dev1",
        "0.5.0b1.dev2",
        "0.5.0b1.dev3",
        "0.5.0b1.dev4",
        "0.5.0b1.dev5",
        "0.5.0b2.dev10",
        "0.5.0b2.dev11",
        "0.5.0b2.dev12",
        "0.5.0b2.dev9",
        "0.5.0b3.dev13",
        "0.5.0b3.dev14",
        "0.5.0b3.dev17",
        "0.5.0b3.dev18",
        "0.5.0b3.dev19",
        "0.5.0b3.dev20",
        "0.5.0b3.dev21",
        "0.5.0b3.dev22",
        "0.5.0b3.dev24",
        "0.5.0b3.dev26",
        "0.5.0b3.dev27",
        "0.5.0b3.dev28",
        "0.5.0b3.dev29",
        "0.5.0b3.dev30",
        "0.5.0b3.dev31",
        "0.5.0b3.dev32",
        "0.5.0b3.dev33",
        "0.5.0b3.dev34",
        "0.5.0b3.dev35",
        "0.5.0b3.dev38",
        "0.5.0b3.dev39",
        "0.5.0b3.dev40",
        "0.5.0b3.dev41",
        "0.5.0b3.dev42",
        "0.5.0b3.dev43",
        "0.5.0b3.dev44",
        "0.5.0b3.dev45",
        "0.5.0b3.dev46",
        "0.5.0b3.dev47",
        "0.5.0b3.dev48",
        "0.5.0b3.dev49",
        "0.5.0b3.dev50",
        "0.5.0b3.dev51",
        "0.5.0b3.dev52",
        "0.5.0b3.dev53",
        "0.5.0b3.dev54",
        "0.5.0b3.dev57",
        "0.5.0b3.dev60",
        "0.5.0b3.dev62",
        "0.5.0b3.dev64",
        "0.5.0b3.dev65",
        "0.5.0b3.dev66",
        "0.5.0b3.dev67",
        "0.5.0b3.dev68",
        "0.5.0b3.dev69",
        "0.5.0b3.dev70",
        "0.5.0b3.dev71",
        "0.5.0b3.dev72",
        "0.5.0b3.dev73",
        "0.5.0b3.dev74",
        "0.5.0b3.dev75",
        "0.5.0b3.dev76",
        "0.5.0b3.dev77",
        "0.5.0b3.dev78"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-24808",
    "GHSA-g3cm-qg2v-2hj5"
  ],
  "details": "### Summary\nOpen redirect vulnerability due to incorrect validation of input values when redirecting users after login.\n\n### Details\npyload is validating URLs via the `get_redirect_url` function when redirecting users at login.\n![301715649-f533db41-d0bd-44f7-8735-be1887fbd06c](https://github.com/pyload/pyload/assets/114328108/7fbec2ed-05ed-46e6-847f-05132cf3f136)\n\n\nThe URL entered in the `next` variable goes through the `is_safe_url` function, where a lack of validation can redirect the user to an arbitrary domain.\n![301715667-2819b1d3-8a14-42f4-89c8-3d2fa84fc309](https://github.com/pyload/pyload/assets/114328108/613484f3-8097-4871-887d-8fa5eec817cc)\n\n\nThe documentation in the urllib library shows that improper URLs are recognized as relative paths when using the `urlparse` function. (https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlparse)\n\nFor example, When an unusual URL like `https:///example.com` is entered, `urlparse` interprets it as a relative path, but in the actual request it is converted to `https://example.com` due to url normalization.\n\n### PoC\n1. In the next variable, insert the URL to which you want to redirect the user.\n![301715949-bb1451eb-5e84-451d-83b4-5c3e204d1df7](https://github.com/pyload/pyload/assets/114328108/6fe639ea-1f85-4715-bf6c-c9c8c4ee9c94)\n\n\n\n2. Check that it is possible to bypass url validation and redirect users to an arbitrary url.\n![301715824-3de6584a-878d-4ec4-a3d5-a34d11c6c0ac](https://github.com/pyload/pyload/assets/114328108/902b3244-a4ef-4f8e-8319-c4b92764f15f)\n![301716107-ba5ab7b9-7aa8-4b7a-8924-eba82442b4c3](https://github.com/pyload/pyload/assets/114328108/35191d7b-50b9-4a46-8319-ebdebec20b41)\n\n\n\n### Impact\nAn attacker can use this vulnerability to redirect users to malicious websites, which can be used for phishing and similar attacks.\n",
  "id": "PYSEC-2026-1817",
  "modified": "2026-07-07T17:25:10.866115Z",
  "published": "2026-07-07T11:45:32.146458Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-g3cm-qg2v-2hj5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-24808"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/commit/fe94451dcc2be90b3889e2fd9d07b483c8a6dccd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/pyload-ng"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-g3cm-qg2v-2hj5"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad open redirect vulnerability due to improper validation of the is_safe_url function"
}



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