Volume Restriction Bypass in Copyparty's SFTP Front End
CVE-2026-93353

6MEDIUM

Key Information:

Vendor

9001

Status
Copyparty
Vendor
CVE Published:
24 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-93353?

Copyparty's SFTP front end is vulnerable to a volume restriction bypass, allowing authenticated users to create, delete, or modify files outside their permitted volume boundaries. By exploiting specific handlers (_mkdir, _rmdir, and _chattr), attackers can craft destination paths without proper access checks, enabling them to traverse symlinks beyond the designated directory. This oversight allows unauthorized file operations via SSH_FXP_SETSTAT on paths their account should not access.

Affected Version(s)

copyparty 0 <= 1.20.24

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-93353 - Proof of Concept

References

https://euriconicacio.github.io/blog/cve-2026-93353-a-vol...
technical-descriptionexploit
https://www.vulncheck.com/advisories/copyparty-sftp-volum...
third-party-advisory

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

euriconicacio
.