CVE-2026-7388: EyouCMS RCE Vulnerability

CVE-2026-7388 Overview

A code injection vulnerability has been identified in EyouCMS up to version 1.7.9. The vulnerability exists in the editFile function within the file application/admin/logic/FilemanagerLogic.php, which is part of the Template File Handler component. An attacker with administrative privileges can exploit this weakness to inject and execute arbitrary code on the target system remotely.

Critical Impact

Authenticated attackers can leverage this code injection flaw to execute arbitrary code on the server, potentially leading to complete system compromise, data theft, or further lateral movement within the network.

Affected Products

• EyouCMS versions up to and including 1.7.9
• Template File Handler component (application/admin/logic/FilemanagerLogic.php)
• Systems utilizing the editFile function for template management

Discovery Timeline

• 2026-04-29 - CVE-2026-7388 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7388

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The flaw resides in EyouCMS's template file management functionality, specifically within the editFile function of the FilemanagerLogic.php file.

The Template File Handler component fails to properly sanitize or validate user-supplied input before processing template file content. This allows an authenticated administrator to inject malicious code through the file editing interface, which is subsequently executed by the server when the template is processed.

The vulnerability requires network access and high-level privileges (administrator role) to exploit. While this limits the attack surface, compromised administrator accounts or insider threats could leverage this flaw to achieve code execution on the underlying server.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the editFile function. The Template File Handler accepts user-controlled content for template files without properly neutralizing special elements that could be interpreted as executable code. This allows injection of malicious code payloads that get processed and executed when templates are rendered or saved.

Attack Vector

The attack is conducted remotely over the network. An attacker must first obtain administrative credentials to the EyouCMS backend, either through credential theft, social engineering, or other authentication bypass techniques. Once authenticated with admin privileges, the attacker can navigate to the template file management interface and modify template files to include injected code.

The injected code could include PHP commands that execute server-side, enabling the attacker to run arbitrary commands, access sensitive data, modify system configurations, or establish persistent backdoor access to the compromised system.

The vulnerability mechanism involves the Template File Handler's failure to sanitize special characters and code constructs within template content. When an administrator edits a template file through the editFile function, malicious code embedded in the content is stored and subsequently executed when the template is processed. For detailed technical information, see the Gitee Issue Discussion and VulDB Vulnerability Detail.

Detection Methods for CVE-2026-7388

Indicators of Compromise

• Unauthorized modifications to template files in the application/admin/logic/ directory
• Suspicious PHP code patterns within template files, particularly those containing eval(), exec(), system(), or shell_exec() functions
• Unexpected outbound network connections from the web server
• New or modified files in the EyouCMS template directories with recent timestamps
• Admin panel access from unusual IP addresses or at unusual times

Detection Strategies

• Monitor file integrity of critical EyouCMS files, especially those in the FilemanagerLogic.php and template directories
• Implement web application firewall (WAF) rules to detect code injection attempts in HTTP POST requests to template editing endpoints
• Review admin panel access logs for suspicious activity patterns or unauthorized access attempts
• Deploy runtime application self-protection (RASP) solutions to detect and block code injection at runtime

Monitoring Recommendations

• Enable detailed logging for all administrative actions within EyouCMS, particularly template file modifications
• Configure alerts for file system changes in the EyouCMS installation directory
• Monitor server processes for unexpected child processes spawned by the web server
• Implement network traffic analysis to detect command-and-control communications

How to Mitigate CVE-2026-7388

Immediate Actions Required

• Audit all administrator accounts and enforce strong password policies with multi-factor authentication
• Review recent template file modifications for signs of code injection
• Restrict administrative access to trusted IP addresses only
• Consider disabling the template file editing functionality until a patch is available
• Implement additional input validation at the web application firewall level

Patch Information

The EyouCMS project has been notified of this vulnerability through an issue report but has not yet responded. No official patch is currently available. Organizations should monitor the EyouCMS Gitee repository for security updates and upgrade to the patched version once released. Additional vulnerability details are available through the VulDB Submission Report.

Workarounds

• Disable or restrict access to the template file editing functionality by modifying access controls or removing the feature temporarily
• Implement strict input validation at the application or reverse proxy level to filter potentially malicious code patterns
• Use file system permissions to make template files read-only, preventing modification through the web interface
• Deploy network segmentation to isolate the EyouCMS server and limit lateral movement in case of compromise

# Example: Restrict template file permissions (Linux)
# Make template directories read-only for the web server user
chmod -R 555 /path/to/eyoucms/application/admin/view/
chown -R root:root /path/to/eyoucms/application/admin/view/

# Restrict access to FilemanagerLogic.php
chmod 444 /path/to/eyoucms/application/admin/logic/FilemanagerLogic.php