PYSEC-2026-1243

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:23
VLAI
Details

Summary

Input in parameter notification_urls is not processed resulting in javascript execution in the application

Details

changedetection.io version: v0.45.21

https://github.com/dgtlmoon/changedetection.io/blob/0.45.21/changedetectionio/forms.py#L226

        for server_url in field.data:
            if not apobj.add(server_url):
                message = field.gettext('\'%s\' is not a valid AppRise URL.' % (server_url))
                raise ValidationError(message)

PoC

Setting > ADD Notification URL List

image

"><img src=x onerror=alert(document.domain)>

image

Requests

image

Impact

A reflected XSS vulnerability happens when the user input from a URL or POST data is reflected on the page without being stored, thus allowing the attacker to inject malicious content

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Impacted products
Name purl
changedetection-io pkg:pypi/changedetection-io
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection-io",
        "purl": "pkg:pypi/changedetection-io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.45.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.38.2",
        "0.39",
        "0.39.1",
        "0.39.10",
        "0.39.10.post1",
        "0.39.10.post2",
        "0.39.11",
        "0.39.12",
        "0.39.13",
        "0.39.13.1",
        "0.39.14",
        "0.39.14.1",
        "0.39.15",
        "0.39.16",
        "0.39.17",
        "0.39.17.1",
        "0.39.17.2",
        "0.39.18",
        "0.39.19",
        "0.39.19.1",
        "0.39.2",
        "0.39.20",
        "0.39.20.1",
        "0.39.20.2",
        "0.39.20.3",
        "0.39.20.4",
        "0.39.21",
        "0.39.21.1",
        "0.39.22",
        "0.39.22.1",
        "0.39.3",
        "0.39.4",
        "0.39.5",
        "0.39.6",
        "0.39.7",
        "0.39.8",
        "0.39.9",
        "0.40.0",
        "0.40.0.1",
        "0.40.0.2",
        "0.40.0.3",
        "0.40.0.4",
        "0.40.1.0",
        "0.40.1.1",
        "0.40.2",
        "0.40.3",
        "0.41",
        "0.41.1",
        "0.42",
        "0.42.1",
        "0.42.2",
        "0.42.3",
        "0.43.1",
        "0.43.2",
        "0.44",
        "0.44.1",
        "0.45",
        "0.45.1",
        "0.45.11",
        "0.45.12",
        "0.45.13",
        "0.45.14",
        "0.45.15",
        "0.45.16",
        "0.45.17",
        "0.45.18",
        "0.45.19",
        "0.45.2",
        "0.45.20",
        "0.45.21",
        "0.45.3",
        "0.45.4",
        "0.45.5",
        "0.45.6",
        "0.45.7",
        "0.45.7.1",
        "0.45.7.2",
        "0.45.7.3",
        "0.45.8",
        "0.45.8.1",
        "0.45.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-34061",
    "GHSA-pwgc-w4x9-gw67"
  ],
  "details": "### Summary\n\nInput in parameter notification_urls is not processed resulting in javascript execution in the application\n\n### Details\nchangedetection.io version: v0.45.21\n\nhttps://github.com/dgtlmoon/changedetection.io/blob/0.45.21/changedetectionio/forms.py#L226\n\n```\n        for server_url in field.data:\n            if not apobj.add(server_url):\n                message = field.gettext(\u0027\\\u0027%s\\\u0027 is not a valid AppRise URL.\u0027 % (server_url))\n                raise ValidationError(message)\n```\n\n### PoC\n\nSetting \u003e ADD Notification URL List\n\n![image](https://github.com/dgtlmoon/changedetection.io/assets/65381453/626eb43b-a414-4b05-92d8-c7345c2a2e75)\n\n\n```\n\"\u003e\u003cimg src=x onerror=alert(document.domain)\u003e\n```\n![image](https://github.com/dgtlmoon/changedetection.io/assets/65381453/476bd396-2aa2-4642-9c54-fd2c2ef9de79)\n\nRequests\n\n![image](https://github.com/dgtlmoon/changedetection.io/assets/65381453/1f258ef1-149a-4a03-88ab-a2244a69652e)\n\n\n### Impact\nA reflected XSS vulnerability happens when the user input from a URL or POST data is reflected on the page without being stored, thus allowing the attacker to inject malicious content\n",
  "id": "PYSEC-2026-1243",
  "modified": "2026-07-07T17:23:53.990009Z",
  "published": "2026-07-07T11:45:40.964806Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-pwgc-w4x9-gw67"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-34061"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/c0f000b1d1ce03733460805dbbedde445fe2c762"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dgtlmoon/changedetection.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/blob/0.45.21/changedetectionio/forms.py#L226"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/changedetection-io"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pwgc-w4x9-gw67"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "changedetection.io Cross-site Scripting vulnerability"
}



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