CVE-2026-27174

Comprehensive Technical Analysis of CVE-2026-27174

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-27174 CVSS Score: 9.8

The vulnerability in MajorDoMo (Major Domestic Module) allows unauthenticated remote code execution (RCE) via the admin panel's PHP console feature. This is a critical vulnerability due to its high CVSS score of 9.8, indicating severe potential impact and ease of exploitation. The lack of proper authentication checks and the direct passing of user-supplied input to the eval() function without sanitization are significant concerns.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: An attacker can exploit this vulnerability without needing any authentication credentials.
• Remote Code Execution: The attacker can execute arbitrary PHP code by sending a crafted GET request to /admin.php with specific parameters (ajax_panel, op, and command).

Exploitation Methods:

• Crafted GET Request: An attacker can send a GET request with malicious parameters to the admin panel's PHP console feature.
• Eval Function: The eval() function in inc_panel_ajax.php executes the user-supplied input directly, allowing for arbitrary code execution.

3. Affected Systems and Software Versions

Affected Systems:

• MajorDoMo (Major Domestic Module)

Software Versions:

• The specific versions affected are not mentioned in the CVE description. However, it is implied that versions prior to the patch (referenced in the GitHub pull request) are vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the patch provided in the GitHub pull request (https://github.com/sergejey/majordomo/pull/1177).
• Disable Unnecessary Features: Disable the PHP console feature if it is not required for operations.
• Access Controls: Implement strict access controls to limit access to the admin panel.

Long-Term Strategies:

• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.
• Input Validation: Ensure all user inputs are properly validated and sanitized before processing.
• Security Training: Provide security training for developers to avoid common vulnerabilities like the use of eval().

5. Impact on Cybersecurity Landscape

This vulnerability highlights the critical importance of secure coding practices and the dangers of using functions like eval() without proper input validation. It underscores the need for continuous monitoring and patching of software systems to prevent unauthenticated RCE attacks. The high CVSS score indicates the potential for significant damage, including data breaches, system compromises, and loss of service.

6. Technical Details for Security Professionals

Vulnerability Details:

• Include Order Bug: An include order bug in modules/panel.class.php allows execution to continue past a redirect() call that lacks an exit statement.
• Ajax Handler: Unauthenticated requests can reach the ajax handler in inc_panel_ajax.php.
• Eval Function: The console handler within inc_panel_ajax.php passes user-supplied input from GET parameters (via register_globals) directly to eval() without any authentication check.

Exploitation Steps:

1. Crafted GET Request: An attacker crafts a GET request to /admin.php with parameters ajax_panel, op, and command.
2. Parameter Injection: The command parameter contains the malicious PHP code to be executed.
3. Eval Execution: The eval() function in inc_panel_ajax.php executes the malicious code.

Example Exploit:

GET /admin.php?ajax_panel=1&op=command&command=<?php system('id'); ?> HTTP/1.1
Host: vulnerable-majordomo.com

References:

• Chocapikk Blog Post
• GitHub Pull Request
• VulnCheck Advisory

Conclusion

CVE-2026-27174 represents a critical vulnerability in MajorDoMo that allows unauthenticated remote code execution. Immediate patching and implementation of strict access controls are essential to mitigate this risk. The cybersecurity community should take this as a reminder of the importance of secure coding practices and continuous monitoring for vulnerabilities.