CVE-2026-104102
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.
Does this matter?
Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.31% probability · 24th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Source
- security-advisories@github.com
EPSS moved from 0.3% on 13 October 2026 to 0.3% on 26 October 2026.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.