CVE-2025-54423: copyparty XSS — Exploit & Fix

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.

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
9001	copyparty	< 1.18.5

References

Advisories & Patches

https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6 https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr

Exploits

https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr

Other References

https://github.com/9001/copyparty/releases/tag/v1.18.5

Frequently Asked Questions

What is CVE-2025-54423? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-54423? +

CVE-2025-54423 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-54423? +

CVE-2025-54423 affects products from 9001, specifically: copyparty. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-54423? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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