CVE-2026-1549: jshERP Path Traversal Vulnerability

CVE-2026-1549 Overview

A path traversal vulnerability has been identified in jishenghua jshERP versions up to 3.6. This vulnerability affects the /jshERP-boot/plugin/uploadPluginConfigFile endpoint within the PluginController component. By manipulating the configFile argument, an attacker can traverse directory paths and potentially access or manipulate files outside the intended directory structure. The vulnerability can be exploited remotely, and exploit details have been publicly disclosed.

Critical Impact

Remote attackers can exploit improper input validation in the file upload functionality to traverse directories, potentially accessing sensitive configuration files or system data on affected jshERP installations.

Affected Products

• jishenghua jshERP up to version 3.6
• jshERP-boot PluginController component
• Systems exposing the /jshERP-boot/plugin/uploadPluginConfigFile endpoint

Discovery Timeline

• 2026-01-28 - CVE-2026-1549 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-1549

Vulnerability Analysis

This path traversal vulnerability (CWE-22) exists in the jshERP plugin configuration file upload functionality. The affected endpoint /jshERP-boot/plugin/uploadPluginConfigFile fails to properly sanitize the configFile parameter, allowing attackers to use directory traversal sequences (such as ../) to escape the intended directory structure.

The vulnerability can be exploited remotely over the network with low attack complexity and requires only low-level privileges. While the immediate impact is limited to unauthorized read access to confidential data, successful exploitation could allow attackers to access sensitive configuration files, application credentials, or other protected system data.

The project maintainers were notified through a GitHub issue report, but have not yet responded to the disclosure.

Root Cause

The root cause of this vulnerability is improper input validation in the PluginController's file upload handling mechanism. The configFile parameter is not adequately sanitized before being used in file system operations, allowing attackers to inject path traversal sequences that navigate outside the intended plugin configuration directory.

Attack Vector

The attack can be executed remotely over the network against exposed jshERP installations. An authenticated attacker with low-level privileges can craft malicious requests to the /jshERP-boot/plugin/uploadPluginConfigFile endpoint, manipulating the configFile parameter with path traversal sequences to access files outside the designated upload directory.

The vulnerability manifests when the application processes the unsanitized file path parameter, allowing navigation through the directory structure. For technical details on the exploitation mechanism, refer to the GitHub issue discussion and VulDB entry.

Detection Methods for CVE-2026-1549

Indicators of Compromise

• HTTP requests to /jshERP-boot/plugin/uploadPluginConfigFile containing path traversal sequences (../, ..\, %2e%2e%2f)
• Unusual file access patterns in jshERP application logs showing attempts to access files outside plugin directories
• Web server logs showing requests with encoded directory traversal characters in the configFile parameter

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor application logs for requests to the PluginController endpoint with suspicious configFile values
• Deploy file integrity monitoring on sensitive configuration directories to detect unauthorized access attempts
• Use SentinelOne Singularity to detect anomalous file system access patterns associated with path traversal exploitation

Monitoring Recommendations

• Enable detailed logging for the /jshERP-boot/plugin/ endpoint to capture all incoming requests
• Configure alerts for HTTP requests containing encoded or unencoded path traversal sequences
• Monitor for unusual file read operations originating from the jshERP application process

How to Mitigate CVE-2026-1549

Immediate Actions Required

• Restrict access to the /jshERP-boot/plugin/uploadPluginConfigFile endpoint to trusted networks only
• Implement network segmentation to limit exposure of jshERP installations
• Deploy WAF rules to block requests containing path traversal patterns
• Review and audit file access permissions for the jshERP application user

Patch Information

As of the last update, the jshERP project maintainers have not responded to the vulnerability disclosure. Users should monitor the jshERP GitHub repository for security updates. Until an official patch is released, implement the workarounds described below to reduce risk.

Workarounds

• Block or restrict access to the /jshERP-boot/plugin/uploadPluginConfigFile endpoint at the network or reverse proxy level
• Implement input validation at the web server or WAF layer to reject requests containing path traversal sequences
• Consider disabling the plugin upload functionality if not required for business operations
• Apply the principle of least privilege to the jshERP application's file system permissions

# Example nginx configuration to block path traversal attempts
location /jshERP-boot/plugin/uploadPluginConfigFile {
    # Block requests containing path traversal patterns
    if ($request_uri ~* "\.\.") {
        return 403;
    }
    # Restrict access to trusted IPs only
    allow 10.0.0.0/8;
    deny all;
}