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Vulnerability record · CVE-2026-30974 · published 10 March 2026

CVE-2026-30974: 9001 copyparty cross-site scripting vulnerability

99001 · Copyparty

Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.

5.4 CVSS 3.1 Medium EPSS 0.34% · top 74.7% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

Copyparty is a portable file server. Prior to v1.20.11., the nohtml config option, intended to prevent execution of JavaScript in user-uploaded HTML files, did not apply to SVG images. A user with write-permission could upload an SVG containing embedded JavaScript, which would execute in the context of whichever user opens it. This has been fixed in v1.20.11.

CVSS:3.1/AV:N/AC:L/PR:L/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/1c9f894e149b6be3cc7de81efc93a4ce4766e0e5 Patch
https://github.com/9001/copyparty/releases/tag/v1.20.11 ProductRelease Notes
https://github.com/9001/copyparty/security/advisories/GHSA-m6hv-x64c-27mm Vendor 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-2026-30974), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.