PYSEC-2026-1278

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/copyparty/PYSEC-2026-1278.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1278
Aliases
Published
2026-07-07T14:34:50.251716Z
Modified
2026-07-07T17:47:21.464405284Z
Severity
  • 3.6 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
copyparty renders unsanitized filenames as HTML when user uploads empty files
Details

Summary

A DOM-Based XSS was discovered in copyparty, a portable fileserver. The vulnerability is considered low-risk.

Details

By handing someone a maliciously-named file, and then tricking them into dragging the file into copyparty's Web-UI, an attacker could execute arbitrary javascript with the same privileges as that user. For example, this could give unintended read-access to files owned by that user. The bug is triggered by the drag-drop action itself; it is not necessary to actually initiate the upload. The file must be empty (zero bytes).

Note: As a general-purpose webserver, it is intentionally possible to upload HTML-files with arbitrary javascript in <script> tags, which will execute when the file is opened. The difference is that this vulnerability would trigger execution of javascript during the act of uploading, and not when the uploaded file was opened.

Proof of Concept (POC)

  1. Create an empty file named <img src=x onerror="alert(1)">
  2. Drag-and-drop the file into the browser to initiate an upload
  3. The alert(1) is executed
References

Affected packages

PyPI / copyparty

Package

Name
copyparty
View open source insights on deps.dev
Purl
pkg:pypi/copyparty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.16.15

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

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/copyparty/PYSEC-2026-1278.yaml"