psi-4ward psitransfer up to 2.4.2 Request Path /files/ path traversal

Summaryinfo

A vulnerability was found in psi-4ward psitransfer up to 2.4.2. It has been classified as critical. The impacted element is an unknown function of the file /files/ of the component Request Path Handler. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2026-41180. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in psi-4ward psitransfer up to 2.4.2. This affects an unknown code block of the file /files/ of the component Request Path Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, the upload PATCH flow under `/files/:uploadId` validates the mounted request path using the still-encoded `req.path`, but the downstream tus handler later writes using the decoded `req.params.uploadId`. In deployments that use a supported custom `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config..js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-41180 since 04/17/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8b547bf3e09757122efa00aab90281e3915aa0c6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• psi-4ward

Name

• psitransfer

Version

• 2.4.0
• 2.4.1
• 2.4.2

License

• open-source

Website

• Product: https://github.com/psi-4ward/psitransfer/

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