---
id: CVE-2026-93353
title: >-
  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…
summary: >-
  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…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-59
  - CWE-424
vendor: '9001'
product: copyparty
affected:
  - copyparty <= 1.20.24
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:18:58.437'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93353'
references:
  - url: >-
      https://euriconicacio.github.io/blog/cve-2026-93353-a-volume-guard-enforced-one-call-site-at-a-time/
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/copyparty-sftp-volume-restriction-bypass-via-mkdir-rmdir-chattr-handlers
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T20:51:40.351Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.