CVE-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 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.

• 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

• 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

• HIGHCVE-2014-125130PoC
• HIGHCVE-2017-20284
• HIGHCVE-2021-48011PoC
• HIGHCVE-2023-54403PoC
• MEDIUMCVE-2024-58386PoC
• HIGHCVE-2024-58387PoC
• HIGHCVE-2024-58388PoC
• MEDIUMCVE-2025-1280

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