CVE-2025-70040: Jimeng-Web-MCP Log Disclosure Flaw

CVE-2025-70040 Overview

CVE-2025-70040 is a sensitive information disclosure vulnerability (CWE-532: Insertion of Sensitive Information into Log File) discovered in LupinLin1 jimeng-web-mcp version 2.1.2. This vulnerability allows an attacker to obtain sensitive information through improperly sanitized log files, potentially exposing credentials, session tokens, or other confidential data that should not be written to application logs.

Critical Impact

Attackers can extract sensitive information from log files, potentially leading to credential theft, session hijacking, or further compromise of affected systems.

Affected Products

• LupinLin1 jimeng-web-mcp v2.1.2

Discovery Timeline

• 2026-03-09 - CVE-2025-70040 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2025-70040

Vulnerability Analysis

This vulnerability falls under CWE-532, which occurs when sensitive information is written to log files in a manner that makes it accessible to unauthorized parties. In jimeng-web-mcp v2.1.2, the application fails to properly sanitize or exclude sensitive data before writing to log files.

The vulnerability is accessible via network-based attack vectors without requiring authentication or user interaction. While the impact is limited to confidentiality disclosure without direct integrity or availability impact, the exposed information could enable attackers to conduct further attacks against the system or its users.

Root Cause

The root cause of this vulnerability lies in inadequate logging practices within the jimeng-web-mcp application. The software logs sensitive information such as user credentials, authentication tokens, API keys, or personal data without proper redaction or filtering mechanisms. This is a common development oversight where debugging information intended for development environments inadvertently makes its way into production deployments.

Attack Vector

The attack vector for this vulnerability is network-based. An attacker who gains access to log files—whether through directory traversal, misconfigured file permissions, log aggregation services, or other means—can extract sensitive information from the logged data. The attack requires low complexity and no special privileges or user interaction, making it particularly concerning for internet-facing deployments.

Technical details and proof-of-concept information can be found in the GitHub Gist PoC Repository. Additional context about the affected project is available at the GitHub Project Repository.

Detection Methods for CVE-2025-70040

Indicators of Compromise

• Unusual access patterns to log files or log directories
• Evidence of log file exfiltration in network traffic
• Unauthorized read access to application log storage locations
• Anomalous queries to log aggregation systems targeting sensitive data patterns

Detection Strategies

• Implement file integrity monitoring on log directories to detect unauthorized access
• Configure alerts for unusual log file access patterns, especially from external IP addresses
• Monitor for reconnaissance activities targeting common log file paths
• Deploy data loss prevention (DLP) rules to detect sensitive data patterns in outbound traffic

Monitoring Recommendations

• Enable audit logging for all log file access attempts
• Implement centralized log management with access controls and monitoring
• Review log files periodically for presence of sensitive data that should be redacted
• Set up alerting for any access to log files from unexpected sources or at unusual times

How to Mitigate CVE-2025-70040

Immediate Actions Required

• Audit current log files for sensitive information and securely delete or redact exposed data
• Restrict file system permissions on log directories to essential personnel only
• Review application logging configuration and disable verbose or debug logging in production
• Implement log rotation with secure deletion of old log files

Patch Information

No official patch information is currently available from the vendor. Organizations using jimeng-web-mcp v2.1.2 should monitor the GitHub Project Repository for updates and security releases. Consider reaching out to the developer via the GitHub User Profile for remediation timelines.

Workarounds

• Implement a logging wrapper that filters sensitive data patterns before writing to logs
• Configure web server and application firewall rules to block external access to log directories
• Move log files to a secure location outside the web root with restricted permissions
• Use environment variables or secure vaults for sensitive configuration instead of passing through code paths that may be logged

# Configuration example - Restrict log directory permissions
chmod 640 /path/to/jimeng-web-mcp/logs/*
chown root:appgroup /path/to/jimeng-web-mcp/logs/
# Ensure logs are not accessible via web server
# Add to nginx configuration:
# location ~* /logs/ { deny all; return 404; }