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Vulnerability record · CVE-2025-54423 · published 28 July 2025

CVE-2025-54423: 9001 copyparty cross-site scripting vulnerability

99001 · 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.

6.1 CVSS 3.1 Medium EPSS 0.41% · top 66.8% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6 Patch
https://github.com/9001/copyparty/releases/tag/v1.18.5 Release Notes
https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-54423), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.