CVE-2026-104102
copyparty FTP: upload outside defined volumes (limited path traversal)
Published Oct 12, 2026 · corrected/updated Oct 15, 2026 · 9001 copyparty · evidence confidence high
The FTP and FTPS server -- if enabled -- would allow uploading to any folder that the copyparty process had permission to write to. The FTP-server is default-disabled, and must be explicitly enabled in the config with global-option or to be affected. Additionally, SFTP was not affected at all; only FTP and FTPS. This was not a full read/write path-traversal; it had the following limitations: * Only applied to uploads; it was not possible to read/download existing files in this manner. * The output filename was not fully controllable; a randomized suffix would always be appended to the filename. * Existing files could not be overwritten or appended to; only new files could be created. * Filesystem-permissions would prevent writing to system folders, as copyparty surely does not run as root in most deployments. * Copyparty itself will not execute arbitrary files as code by default, so this vulnerability could not be used to execute arbitrary code through copyparty. The main concern is the potential effect on other unrelated software which is running on the same system. The severity is assuming the worst case (SC:H/SI:H), that the same machine is running some unrelated software that will execute new arbitrarily-named files as code, and that the copyparty process has sufficient privileges to write files into the config-folder of that unrelated software.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-104102 is a medium public vulnerability record for 9001 copyparty. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether 9001 copyparty is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: copyparty (0 → 1.20.19); copyparty (< 1.20.19); copyparty; 9001 copyparty. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 5.3, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-22. Sources contributing to this record: cve_org, epss, github, gitlab. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2026 · GitHub Advisory Database
Detected
The FTP and FTPS server -- if enabled -- would allow uploading to any folder that the copyparty process had permission to write to. The FTP-server is default-disabled, and must be explicitly enabled in the config with global-option or to be affected. Additionally, SFTP was not affected at all; only FTP and FTPS. This was not a full read/write path-traversal; it had the following limitations: * Onl
Oct 15, 2026 · GitHub Advisory Database
Fix available
copyparty fixed in 1.20.19
Oct 15, 2026 · GitHub Advisory Database
Fix available
copyparty fixed in 1.20.19
Oct 15, 2026 · GitHub Advisory Database
Updated
The FTP and FTPS server -- if enabled -- would allow uploading to any folder that the copyparty process had permission to write to. The FTP-server is default-disabled, and must be explicitly enabled in the config with global-option or to be affected. Additionally, SFTP was not affected at all; only FTP and FTPS. This was not a full read/write path-traversal; it had the following limitations: * Onl
Affected
- PyPI copyparty0 → 1.20.19
- pip copyparty< 1.20.19
- pypi copypartyversion unspecified
- vendor 9001 copypartyversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-104102
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
cve.org - FIRST EPSSExploitation probabilityCVE-2026-104102
30-day exploitation probability 0.3%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-phv8-wgjp-g4p9
GitHub Advisory Database record mirrored by OSV.
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-104102
The FTP and FTPS server – if enabled – would allow uploading to any folder that the copyparty process had permission to write to. The FTP-server is default-disabled, and must be explicitly enabled in the config with global-option ftp or ftps to be affected. Additionally, SFTP was not affected at all; only FTP and FTPS. This was not a full read/write path-traversal; it had the following
advisories.gitlab.com - OSV.devPackage advisoryGHSA-phv8-wgjp-g4p9
copyparty FTP: upload outside defined volumes (limited path traversal)
osv.dev