Vulnerability Description
copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://euriconicacio.github.io/blog/cve-2026-93353-a-volume-guard-enforced-one-
- https://www.vulncheck.com/advisories/copyparty-sftp-volume-restriction-bypass-vi
FAQ
What is CVE-2026-93353?
CVE-2026-93353 is a vulnerability with a CVSS score of 3.1 (LOW). copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundar...
How severe is CVE-2026-93353?
CVE-2026-93353 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93353?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.