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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 5.3NVD modified 2026-10-13 17:17
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 6
- https://github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86
- https://github.com/9001/copyparty/releases/tag/v1.20.19
- https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9
- https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9
- https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9
- https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9