XSS in 9001 Copyparty
CVE-2026-30974
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- 9001 Copyparty — versions < 1.20.11
Weakness classification (CWE)
References
- github.com/9001/copyparty/security/advisories/GHSA-m6hv-x64c-27mm (Vendor Advisory)
- github.com/9001/copyparty/commit/1c9f894e149b6be3cc7de81efc93a4ce4766e0e5 (Patch)
- github.com/9001/copyparty/releases/tag/v1.20.11 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30974?
- CVE-2026-30974 is a medium-severity vulnerability in 9001 Copyparty, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2026-03-10.
- How severe is CVE-2026-30974?
- Medium severity. CVSS v3 base score is 4.6 out of 10.