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Vulnerability record · CVE-2025-66480 · published 2 February 2026

CVE-2025-66480: Wildfirechat im-server path traversal vulnerability

Wildfirechat · Im Server

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.

9.8 CVSS 3.1 Critical EPSS 1.5% · top 27.7% CWE-22 · Path traversalCWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/wildfirechat/im-server/commit/2f9c4e028c01c64913cab32e7248bcca183a5230 Patch
https://github.com/wildfirechat/im-server/releases/tag/1.4.3 Release Notes
https://github.com/wildfirechat/im-server/security/advisories/GHSA-74hq-jhx2-fq6c Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-66480), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.