CVE-2026-104102: Path Traversal

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.

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Weakness Type (CWE)

CWE-22 Path Traversal

References

Other 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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-104102? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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