Forceu Gokapi up to 1.x cross site scripting

Summaryinfo

A vulnerability was found in Forceu Gokapi up to 1.x. It has been classified as problematic. This vulnerability affects unknown code. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2025-48494. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Forceu Gokapi up to 1.x and classified as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Gokapi is a self-hosted file sharing server with automatic expiration and encryption support. When using end-to-end encryption, a stored cross-site scripting vulnerability can be exploited by uploading a file with JavaScript code embedded in the filename. After upload and every time someone opens the upload list, the script is then parsed. Prior to version 2.0.0, there was no user permission system implemented, therefore all authenticated users were already able to see and modify all resources, even if end-to-end encrypted, as the encryption key had to be the same for all users using a version prior to 2.0.0. If a user is the only authenticated user using Gokapi, they are not affected. This issue has been fixed in v2.0.0. A possible workaround would be to disable end-to-end encryption.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-48494 since 05/22/2025. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 2.0.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 343cc566cfd7f4efcd522c92371561d494aed6b0 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.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-16640). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Forceu

Name

• Gokapi

Version

• 1.x

License

• open-source

Website

• Product: https://github.com/Forceu/Gokapi/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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