What’s Vulnerable › Vulnerabilities

CVE-2026-104102: copyparty FTP: upload outside defined volumes (limited path traversal)

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-13
• Weakness: CWE-22

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.

Affected products

• 9001 copyparty: before 1.20.19

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

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