# CVE-2026-32109: Copyparty XSS via crafted URL to folder with .prologue.html

Source: https://junglewise.ai/threats/cve-2026-32109-copyparty-xss-via-crafted-url-to-folder-with-prologue-html  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-12. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2026-32109 · Severity: low · CVSS 3.7 · Published 2026-03-12

Copyparty, a file-sharing server, contains a vulnerability where an attacker with existing file-upload permissions can execute malicious code in another user's browser. By uploading a specifically named file and tricking a victim into clicking a crafted link, the attacker could perform actions on the server using the victim's account. This could lead to unauthorized file deletion, movement, or the uploading of new files.

Technologies: [copyparty (PyPI)](https://junglewise.ai/threats/technologies/copyparty). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-32109 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-32109 being exploited in the wild.

**How severe is CVE-2026-32109?** Low severity, with a CVSS score of 3.7, published 12 March 2026.

**Which products and versions are affected?** copyparty (PyPI) < 1.20.12, ECOSYSTEM:introduced=0,fixed=1.20.12.

**Is there a fix for CVE-2026-32109?** Yes. copyparty (PyPI): upgrade to 1.20.12 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-32109 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-32109?** Check whether you run copyparty (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- copyparty (PyPI): upgrade to 1.20.12 or later

  ```sh
  pip install "copyparty>=1.20.12"
  ```


## Technical details

A Cross-Site Scripting (XSS) vulnerability exists in Copyparty due to improper neutralization of input during web page generation. If an attacker has read and write permissions, they can upload a file named '.prologue.html'. While executing JavaScript when directly accessing this file is intended, the vulnerability allows the file to be evaluated when a victim visits a crafted folder URL (e.g., '/folder/?b'). Exploitation requires the victim to click a specific link, and impact is mitigated by strict SameSite cookie policies, meaning the link must typically be clicked from a page served by the same server. If successful, the attacker can execute arbitrary JavaScript in the victim's session to manipulate files. This is fixed in version 1.20.12.

## Affected products

- 9001 copyparty < 1.20.12

## Identifiers

- CVE-2026-32109
- GHSA-rcp6-88mm-9vgf
- PYSEC-2026-32

## Timeline

- 2026-03-11: disclosed
- 2026-03-12: advisory: GitHub Advisory published
- 2026-03-12: patched

## References

- [https://api.github.com/users/thesanjok](https://api.github.com/users/thesanjok)
- [https://github.com/thesanjok](https://github.com/thesanjok)
- [https://api.github.com/users/thesanjok/gists%7B/gist_id%7D](https://api.github.com/users/thesanjok/gists%7B/gist_id%7D)
- [https://api.github.com/users/thesanjok/repos](https://api.github.com/users/thesanjok/repos)
- [https://avatars.githubusercontent.com/u/55534535?v=4](https://avatars.githubusercontent.com/u/55534535?v=4)
- [https://api.github.com/users/thesanjok/events%7B/privacy%7D](https://api.github.com/users/thesanjok/events%7B/privacy%7D)

## Related threats

- [copyparty FTP path traversal in upload](https://junglewise.ai/threats/cve-2026-104102-copyparty-ftp-upload-outside-defined-volumes-limited-path)
- [Copyparty file/dirkey confusion authorization bypass](https://junglewise.ai/threats/cve-2026-70657-copyparty-file-dirkey-confusion-authorization-bypass)
- [PYSEC-2026-1279 - copyparty: Sharing a single file does not fully restrict access to other files in source folder](https://junglewise.ai/threats/cve-2025-58753-copyparty-sharing-a-single-file-does-not-fully-restrict-access-to)
- [PYSEC-2026-1275 - copyparty allows Regex Denial of Service (ReDoS) in the upload listing](https://junglewise.ai/threats/cve-2025-54796-copyparty-allows-regex-denial-of-service-redos-in-the-upload)
- [PYSEC-2026-1276 - copyparty Reflected XSS via Filter Parameter](https://junglewise.ai/threats/cve-2025-54589-copyparty-reflected-xss-via-filter-parameter)