What is the CVSS score of CVE-2026-27948?

CVE-2026-27948 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Copyparty are affected by CVE-2026-27948?

Organizations using versions should be aware of moderate risk from CVE-2026-27948, a cross-site scripting vulnerability rated CVSS 5.4.. A patch is available.

How to fix or mitigate CVE-2026-27948?

Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Copyparty CVE-2026-27948

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-26 security-advisories@github.com

GHSA-62cr-6wp5-q43h

XSS Copyparty 9001

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

Patch released

Feb 28, 2026 - 00:56 nvd

Patch available

CVE Published

Feb 26, 2026 - 02:16 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

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.

AnalysisAI

Reflected XSS in Copyparty before version 1.20.9 allows unauthenticated attackers to inject malicious scripts through the setck URL parameter, potentially enabling session hijacking or credential theft from affected users. The vulnerability requires user interaction to click a crafted link but can be exploited remotely without authentication. A patch is available in version 1.20.9 and later.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Copyparty. 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.

RemediationAI

A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.