CVE-2026-104102 Details
Description
copyparty is a portable file server. Prior to 1.20.19, FTP upload path handling does not confine destinations to configured copyparty volumes. When FTP or FTPS is explicitly enabled, a low-privileged authenticated user can submit traversal paths during upload to create a new file outside configured volumes wherever the copyparty process has write permission. The attacker cannot read or overwrite files, the output name receives a randomized suffix, and copyparty does not execute the file; however, unrelated software on the same host could process the newly created file. This issue is fixed in version 1.20.19.
A path traversal vulnerability has been identified in Copyparty's FTP upload handling, prior to version 1.20.19. When FTP or FTPS is enabled, low-privileged authenticated users can exploit this vulnerability by submitting traversal paths during file uploads. This allows them to create files outside of the designated Copyparty volumes, wherever the Copyparty process has write permissions. While the vulnerability does not permit reading or overwriting existing files, and the uploaded files are not executed by Copyparty, there is a risk that unrelated software on the same host could process the newly created files.
Users can upgrade to Copyparty version 1.20.19 or later to address this vulnerability. The FTP server must be explicitly enabled in the configuration to be affected by this issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86 | [email protected] | Source CodeVendor |
| https://github.com/9001/copyparty/releases/tag/v1.20.19 | [email protected] | Release NotesVendor |
| https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| copyparty | < 1.20.19 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |