Copyparty vulnerable to reflected XSS via setck parameter
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).
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | copyparty | < 1.20.9 | 1.20.9 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
copyparty- Disclosed
- 26.02.2026
- Updated
- 11.10.2026 14:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2136 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-62cr-6wp5-q43h - CC BY 4.0
Vulnerability history: copyparty
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 07.2023 08.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 3
- Medium 8
- Low 3
Disclosures per year
- 2023: 3
- 2024: 0
- 2025: 6
- 2026: 5
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Copyparty vulnerable to reflected XSS via setck parameter this entry
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