wildfirechat im-server up to 1.4.2 Endpoint /fs writeFileUploadData path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in wildfirechat im-server up to 1.4.2. Affected by this vulnerability is the function writeFileUploadData of the file /fs of the component Endpoint. Performing a manipulation results in path traversal. This vulnerability is reported as CVE-2025-66480. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in wildfirechat im-server up to 1.4.2. This affects the function writeFileUploadData of the file /fs of the component Endpoint. 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:

Wildfire IM is an instant messaging and real-time audio/video solution. Prior to 1.4.3, a critical vulnerability exists in the im-server component related to the file upload functionality found in com.xiaoleilu.loServer.action.UploadFileAction. The application exposes an endpoint (/fs) that handles multipart file uploads but fails to properly sanitize the filename provided by the user. Specifically, the writeFileUploadData method directly concatenates the configured storage directory with the filename extracted from the upload request without stripping directory traversal sequences (e.g., ../../). This vulnerability allows an attacker to write arbitrary files to any location on the server's filesystem where the application process has write permissions. By uploading malicious files (such as scripts, executables, or overwriting configuration files like authorized_keys or cron jobs), an attacker can achieve Remote Code Execution (RCE) and completely compromise the server. This vulnerability is fixed in 1.4.3.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-66480 since 12/02/2025. The exploitability is told to be easy. 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 1.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 2f9c4e028c01c64913cab32e7248bcca183a5230 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

Type

• Chat Software

Vendor

• wildfirechat

Name

• im-server

Version

• 1.4.0
• 1.4.1
• 1.4.2

License

• open-source

Website

• Product: https://github.com/wildfirechat/im-server/

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CPE 2.2info

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