CVE-2026-104102
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
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.
Risk Assessment
The attacker cannot read or overwrite files, and the output name receives a randomized suffix, but unrelated software on the same host could process the newly created file. This may lead to unauthorized file creation and potential further attacks.
Recommendation
Update copyparty to version 1.20.19 or later, which fixes this vulnerability. It is also recommended to restrict write permissions of the copyparty process and disable FTP/FTPS if not required.
Other vulnerabilities in copyparty
See all- CVE-2023-38501Medium
The copyparty file server software prior to version 1.8.7 contains a reflected XSS vulnerability via URL parameters `?k304=...` and `?setck=...`. This can lead to moving or deleting existing files on the server, as well as uploading new files using the account of the person who clicks the malicious link.
- CVE-2023-37474High
Copyparty is a portable file server that is vulnerable to a path traversal attack in the `.cpr` subfolder in versions prior to 1.8.2. This attack allows access to files, directories, and commands outside the web document root directory.
- CVE-2026-93353Low
copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement.
- CVE-2026-70657Medium
Copyparty is a portable file server. Prior to 1.20.17, copyparty volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key, granting read access to the containing folder. This vulnerability was only reachable if both types of keys (filekeys and dirkeys) were manually enabled in the volume flags simultaneously. This issue is fixed in version 1.20.17.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS