OpenListTeam OpenList up to 4.2.3 Path Normalization fsbatch.go api/fs/batch_rename src_name path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in OpenListTeam OpenList up to 4.2.3. Affected by this vulnerability is the function api/fs/batch_rename of the file server/handles/fsbatch.go of the component Path Normalization. Such manipulation of the argument src_name leads to path traversal. This vulnerability is uniquely identified as CVE-2026-73509. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OpenListTeam OpenList up to 4.2.3 and classified as critical. Affected by this issue is the function api/fs/batch_rename of the file server/handles/fsbatch.go of the component Path Normalization. The manipulation of the argument src_name 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:

OpenList a file list program that supports multiple storage. Prior to 4.2.4, the authenticated /api/fs/batch_rename handler in server/handles/fsbatch.go authorizes only the source directory produced by user.JoinPath(req.SrcDir) and validates renameObject.NewName with checkRelativePath, but does not validate attacker-controlled renameObject.SrcName, supplied as src_name, before concatenating it with the authorized path and passing the result to fs.Rename. A user with rename permission can use traversal segments in src_name to make path normalization select a file outside the authorized directory and configured base path, resulting in cross-user file integrity loss, limited availability impact, and file-existence disclosure through success or error responses. This issue is fixed in version 4.2.4.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-73509 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 4.2.4 eliminates this vulnerability.

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Productinfo

Vendor

• OpenListTeam

Name

• OpenList

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3

Website

• Product: https://github.com/OpenListTeam/OpenList/

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