CVE-2025-29306: Foxcms Foxcms RCE Vulnerability

CVE-2025-29306 Overview

CVE-2025-29306 is a critical Remote Code Execution (RCE) vulnerability affecting FoxCMS version 1.2.5. The vulnerability exists within the case display page functionality in the index.html component, allowing remote attackers to execute arbitrary code on vulnerable systems without authentication.

Critical Impact

This vulnerability enables unauthenticated remote code execution through the case display page component, potentially allowing complete system compromise.

Affected Products

• FoxCMS v.1.2.5
• FoxCMS versions prior to v.1.2.5 (potentially affected)

Discovery Timeline

• 2025-03-27 - CVE-2025-29306 published to NVD
• 2025-06-09 - Last updated in NVD database

Technical Details for CVE-2025-29306

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code, also known as Code Injection). The flaw resides in the case display page functionality within the index.html component of FoxCMS. The application fails to properly sanitize or validate user-supplied input before processing it, allowing attackers to inject and execute arbitrary code on the underlying server.

The network-based attack vector requires no authentication or user interaction, making this vulnerability particularly dangerous in internet-facing deployments. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2025-29306 stems from improper input validation and insufficient sanitization within the case display page component. The application does not adequately filter or escape user-controlled data before incorporating it into executable code paths, creating an injection point that attackers can leverage for remote code execution.

Attack Vector

The attack is conducted remotely over the network against the vulnerable index.html component. An attacker can craft malicious requests targeting the case display page functionality to inject arbitrary code. Since no authentication is required and no user interaction is necessary, the vulnerability can be exploited directly against any exposed FoxCMS installation running the vulnerable version.

Public proof-of-concept exploits are available demonstrating the exploitation technique. For technical details, refer to the GitHub PoC Repository and the Mattb709 PoC Repository.

Detection Methods for CVE-2025-29306

Indicators of Compromise

• Unusual HTTP requests to the case display page or index.html component containing code injection patterns
• Unexpected processes spawned by the web server or PHP runtime
• New files or scripts appearing in web-accessible directories
• Anomalous outbound network connections from the FoxCMS server

Detection Strategies

• Monitor web application logs for suspicious requests targeting the case display functionality
• Implement Web Application Firewall (WAF) rules to detect and block code injection attempts
• Deploy file integrity monitoring on the FoxCMS installation directory
• Analyze network traffic for command-and-control patterns or data exfiltration attempts

Monitoring Recommendations

• Enable verbose logging on the FoxCMS application and web server
• Configure alerting for any code injection patterns in HTTP request parameters
• Monitor system process trees for child processes spawned by web server processes
• Review access logs regularly for reconnaissance activity against the vulnerable endpoint

How to Mitigate CVE-2025-29306

Immediate Actions Required

• Identify all FoxCMS v.1.2.5 installations in your environment and assess their exposure
• Restrict network access to vulnerable FoxCMS instances using firewall rules
• Place vulnerable systems behind a Web Application Firewall (WAF) with code injection rules enabled
• Consider temporarily disabling the case display functionality if not critical to operations

Patch Information

No official vendor patch or security advisory has been published at the time of this writing. Organizations should monitor the FoxCMS project for security updates and apply patches immediately when available. Contact the FoxCMS vendor directly for remediation guidance.

Workarounds

• Implement strict input validation and output encoding at the web server or reverse proxy level
• Deploy a WAF with rules specifically targeting code injection and RCE attempts
• Restrict access to the FoxCMS administrative interface and case display pages to trusted IP addresses only
• Consider migrating to an alternative CMS solution if patches are not forthcoming

# Example: Restrict access to FoxCMS using iptables
# Allow only trusted management IP to access the application
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP_ADDRESS -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP_ADDRESS -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP