Connect-CMS - CraftedSignal Threat Feed

Connect-CMS Code Study Plugin Arbitrary Code Execution

hello@craftedsignal.io — Mon, 29 Jan 2024 12:00:00 +0000

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

An attacker gains valid credentials for a Connect-CMS user account through social engineering or credential stuffing.
The attacker logs into the Connect-CMS application with the obtained credentials.
The attacker navigates to the Code Study Plugin interface within the Connect-CMS application.
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.
The Connect-CMS application processes the malicious request without proper sanitization.
The injected code executes within the context of the Connect-CMS application on the server.
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.

Connect CMS Improper Authorization Vulnerability

hello@craftedsignal.io — Tue, 02 Jan 2024 12:00:00 +0000

Connect CMS is susceptible to an improper authorization vulnerability within its My Page profile update feature. This flaw allows an authenticated attacker to modify the profile information of other users, potentially leading to account takeover. The vulnerability resides in versions 1.x series <= 1.41.0 and 2.x series <= 2.41.0 of Connect CMS. Successful exploitation could allow attackers to change passwords, email addresses, or other sensitive data associated with targeted user accounts. This issue was reported by Sho Odagiri of GMO Cybersecurity by Ierae, Inc. on March 23, 2026, and affects any Connect CMS instance running the vulnerable versions, creating a significant risk for organizations relying on this CMS for their web presence. It is crucial for defenders to identify and patch vulnerable instances to prevent potential account compromise and data breaches.

Attack Chain

An attacker authenticates to the Connect CMS application with valid credentials.
The attacker identifies the vulnerable My Page profile update feature.
The attacker crafts a malicious HTTP request targeting the profile update endpoint.
In the crafted request, the attacker manipulates the user identifier parameter (e.g., user ID, username) to specify the target user's account.
The attacker modifies profile information within the request body (e.g., email address, password).
The attacker sends the crafted request to the Connect CMS server.
Due to the improper authorization, the server processes the request without verifying if the attacker has permission to modify the target user's profile.
The target user's profile is updated with the attacker-supplied information, potentially leading to account takeover.

Impact

Successful exploitation of this vulnerability can lead to the complete takeover of arbitrary user accounts within the Connect CMS platform. Affected organizations could experience unauthorized access to sensitive data, data breaches, and reputational damage. This vulnerability could affect any organization using a vulnerable version of Connect CMS, potentially impacting thousands of users if left unpatched. The impact is significant because account takeover can lead to further lateral movement within an organization's systems, depending on the privileges associated with the compromised accounts.

Recommendation

Immediately upgrade Connect CMS installations to versions 1.41.1 or 2.41.1 or later to patch CVE-2026-32300.
Implement web application firewall (WAF) rules to detect and block suspicious requests targeting the profile update endpoint, filtering for manipulated user identifier parameters.
Deploy the Sigma rule Connect CMS Profile Update Manipulation to detect attempts to modify user profiles through the vulnerable endpoint based on HTTP request parameters.