What is CVE-2026-27948?

CVE-2026-27948 is a medium-severity vulnerability in 9001 Copyparty, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-26.

How severe is CVE-2026-27948?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in 9001 Copyparty

CVE-2026-27948

Copyparty is a portable file server. In versions prior to 1.20.9, an XSS allows for reflected cross-site scripting via URL-parameter `?setck=...`. Version 1.20.9 fixes the issue.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

9001 Copyparty — versions < 1.20.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/9001/copyparty/security/advisories/GHSA-62cr-6wp5-q43h (x_refsource_CONFIRM)
https://github.com/9001/copyparty/commit/31b2801fd041f803f4a3d5c12c7d7cb5419048bc (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27948?: CVE-2026-27948 is a medium-severity vulnerability in 9001 Copyparty, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-26.
How severe is CVE-2026-27948?: Medium severity. CVSS v3 base score is 5.4 out of 10.