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Fencer Vulns
medium 6.3

CVE-2025-54589 json

copyparty Reflected XSS via Filter Parameter

published 2025-07-31 15 mo ago modified 2026-07-07 4 mo ago also EUVD-2025-23272 , GHSA-8mx2-rjh8-q3jq , PYSEC-2026-1276

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 83%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

Copyparty is a portable file server. In versions 1.18.6 and below, when accessing the recent uploads page at `/?ru`, users can filter the results using an input field at the top. This field appends a filter parameter to the URL, which reflects its value directly into a `<script>` block without proper escaping, allowing for reflected Cross-Site Scripting (XSS) and can be exploited against both authenticated and unauthenticated users. This is fixed in version 1.18.7.

Patch / fix

  • pypi copyparty 1.18.7
  • 9001 copyparty 1.18.7
  • copyparty_project copyparty 1.18.7

Timeline

  1. Published
  2. First public exploit (EDB-52390)

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
15 mo ago

Exploit prediction

2.38% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52390 Copyparty 1.18.6 - Reflected Cross-Site Scripting (XSS) webapps, 2025-08-03
  • Nuclei template Copyparty <=1.18.6 - Cross-Site Scripting nuclei detection template
  • github.com https://github.com/9001/copyparty/security/advisories/GHSA-8mx2-rjh8-q3jq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
OSV 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
pypi copyparty
<1.18.7
1.18.7

Affected products

  • 9001 copyparty

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.