SFTPGo versions before v2.7.1 contain an input validation issue in the handling of dynamic group paths, for example, home directories or key prefixes.
When a group is configured with a dynamic home directory or key prefix using placeholders like %username%, the value replacing the placeholder is not strictly sanitized against relative path components. Consequently, if a user is created with a specially crafted username the resulting path may resolve to a parent directory instead of the intended sub-directory.
This issue is fixed in version v2.7.1
{
"cwe_ids": [
"CWE-20",
"CWE-22"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-13T18:56:14Z",
"nvd_published_at": "2026-03-13T19:54:35Z",
"severity": "MODERATE"
}