copyparty up to 1.20.24 SFTP Front End _mkdir/_rmdir/_chattr path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in copyparty up to 1.20.24. This affects the function _mkdir/_rmdir/_chattr of the component SFTP Front End. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-93353. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in copyparty up to 1.20.24. It has been rated as critical. Affected by this issue is the function _mkdir/_rmdir/_chattr of the component SFTP Front End. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at euriconicacio.github.io. This vulnerability is handled as CVE-2026-93353 since 09/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/24/2026). The MITRE ATT&CK project declares the attack technique as T1006.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• copyparty

Version

• 1.20.0
• 1.20.1
• 1.20.2
• 1.20.3
• 1.20.4
• 1.20.5
• 1.20.6
• 1.20.7
• 1.20.8
• 1.20.9
• 1.20.10
• 1.20.11
• 1.20.12
• 1.20.13
• 1.20.14
• 1.20.15
• 1.20.16
• 1.20.17
• 1.20.18
• 1.20.19
• 1.20.20
• 1.20.21
• 1.20.22
• 1.20.23
• 1.20.24

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CPE 2.2info

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