Connect-CMS Code Study Plugin Arbitrary Code Execution

A vulnerability exists in the Code Study Plugin for Connect-CMS, a content management system. The vulnerability, identified as CVE-2026-32276, allows an authenticated user to execute arbitrary code on the server. This affects Connect-CMS versions 1.x prior to 1.41.1 and 2.x prior to 2.41.1. The vulnerability was reported by Sho Odagiri of GMO Cybersecurity by Ierae, Inc. Exploitation could lead to unauthorized code execution on the server or sensitive information disclosure. Organizations using affected versions of Connect-CMS are urged to update to versions 1.41.1 or 2.41.1 to mitigate the risk. The root cause involves insufficient input validation or sanitization in the Code Study Plugin.

Attack Chain

1. An attacker gains valid credentials for a Connect-CMS user account through social engineering or credential stuffing.
2. The attacker logs into the Connect-CMS application with the obtained credentials.
3. The attacker navigates to the Code Study Plugin interface within the Connect-CMS application.
4. The attacker crafts a malicious request containing arbitrary code within the Code Study Plugin's parameters. The specific vulnerable parameter is not defined in the advisory and will require investigation to identify.
5. The Connect-CMS application processes the malicious request without proper sanitization.
6. The injected code executes within the context of the Connect-CMS application on the server.
7. The attacker achieves arbitrary code execution, allowing them to perform actions such as installing backdoors, creating new user accounts, or accessing sensitive data.

Impact

Successful exploitation of this vulnerability, CVE-2026-32276, can lead to arbitrary code execution on the Connect-CMS server. This could result in complete compromise of the server, including sensitive data disclosure, modification of website content, and potential lateral movement to other systems within the network. The impact depends on the permissions of the Connect-CMS application user. This could affect any organization using the Code Study Plugin in Connect-CMS.

Recommendation

• Immediately update Connect-CMS to versions 1.41.1 (for the 1.x series) or 2.41.1 (for the 2.x series) to patch the vulnerability as mentioned in the advisory.
• Implement strong password policies and multi-factor authentication to protect Connect-CMS user accounts from unauthorized access which is needed to trigger the vulnerability.
• Monitor web server logs for suspicious activity related to the Code Study Plugin, focusing on unusual HTTP requests and error messages to help identify potential exploitation attempts.
• Deploy the Sigma rule "Connect-CMS Code Study Plugin Potential Code Execution" to detect exploitation attempts by monitoring web server logs for POST requests with suspicious parameters to the Code Study Plugin.