GHSA-62CR-6WP5-Q43H

Vulnerability from github – Published: 2026-02-26 22:33 – Updated: 2026-02-26 22:33
VLAI
Summary
Copyparty vulnerable to reflected XSS via setck parameter
Details

Summary

An XSS allows for reflected cross-site scripting via URL-parameter ?setck=...

Details

A reflected cross-site scripting (XSS) vulnerability could allow an attacker to execute malicious javascript by tricking users into accessing a malicious link.

The worst-case outcome of this is being able to move or delete existing files on the server, or upload new files, using the account of the person who clicks the malicious link.

Indicators of Compromise

All attempted attacks (successful or not) would be logged to both the copyparty serverlog and the accesslog of the reverseproxy, and are detected by grep -E '[?&]setck=[^&"]*%' (the text setck= eventually followed by the % character).

Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "copyparty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.20.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27948"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-26T22:33:46Z",
    "nvd_published_at": "2026-02-26T02:16:22Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nAn XSS allows for reflected cross-site scripting via URL-parameter `?setck=...`\n\n### Details\nA reflected cross-site scripting (XSS) vulnerability could allow an attacker to execute malicious javascript by tricking users into accessing a malicious link.\n\nThe worst-case outcome of this is being able to move or delete existing files on the server, or upload new files, using the account of the person who clicks the malicious link.\n\n### Indicators of Compromise\nAll attempted attacks (successful or not) would be logged to both the copyparty serverlog and the accesslog of the reverseproxy, and are detected by `grep -E \u0027[?\u0026]setck=[^\u0026\"]*%\u0027` (the text `setck=` eventually followed by the `%` character).",
  "id": "GHSA-62cr-6wp5-q43h",
  "modified": "2026-02-26T22:33:46Z",
  "published": "2026-02-26T22:33:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/security/advisories/GHSA-62cr-6wp5-q43h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27948"
    },
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/commit/31b2801fd041f803f4a3d5c12c7d7cb5419048bc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/9001/copyparty"
    },
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/releases/tag/v1.20.9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Copyparty vulnerable to reflected XSS via setck parameter"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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