CVE-2026-32108: Copyparty ftp/sftp: Sharing a single file did not fully restrict source-folder access
Copyparty is a portable file server. Prior to 1.20.12, there was a missing permission-check in the shares feature (the shr global-option). This vulnerability only applies when the shares feature is used for the specific purpose of creating a share of just a single file inside a folder or either the FTP or SFTP server is enabled, and also made publicly accessible. Given these conditions, when a user is browsing a share through either FTP or SFTP (not http or https), they can gain read-access to the remaining files inside the shared folder by guessing/bruteforcing the filenames. It was not possible to descend into subdirectories in this manner; only the sibling files were accessible. This vulnerability is similar to CVE-2025-58753 which was previously fixed for HTTP and HTTPS, but not for FTP. The FTPS server did not yet exist at that time. This vulnerability is fixed in 1.20.12.
Other sources
There was a missing permission-check in the shares feature (the shr global-option).
This vulnerability only applies in the following scenario: The shares feature is used for the specific purpose of creating a share of just a single file inside a folder Either the FTP or SFTP server is enabled, and also made publically accessible If a share is password-protected, then SFTP was not vulnerable unless the sftp-pw global-option was also enabled
Given these conditions, when a user is browsing a share through either FTP or SFTP (not http or https), they can gain read-access to the remaining files inside the shared folder by guessing/bruteforcing the filenames.
It was not possible to descend into subdirectories in this manner; only the sibling files were accessible.
This issue did not affect filekeys or dirkeys.
This vulnerability is CVE-2025-58753 which was previously fixed for HTTP and HTTPS, but not for FTP. The FTPS server did not yet exist at that time.
— GitHub
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-32108?
CVE-2026-32108 is classified as a medium severity vulnerability due to insufficient access controls.
How do I fix CVE-2026-32108?
To remediate CVE-2026-32108, upgrade Copyparty to version 1.20.12 or later.
What feature is affected by CVE-2026-32108?
CVE-2026-32108 specifically affects the sharing feature in Copyparty, allowing potential unauthorized access.
What versions of Copyparty are vulnerable to CVE-2026-32108?
Versions of Copyparty prior to 1.20.12 are vulnerable to CVE-2026-32108.
Can CVE-2026-32108 lead to unauthorized access?
Yes, CVE-2026-32108 can potentially allow unauthorized users to access restricted folders when a single file is shared.