CVE-2026-32278 in connect-cms
Summary
by MITRE • 03/24/2026
Connect-CMS is a content management system. In versions on the 1.x series up to and including 1.41.0 and versions on the 2.x series up to and including 2.41.0, a Stored Cross-site Scripting (XSS) issue exists in the file field of the Form Plugin. Versions 1.41.1 and 2.41.1 contain a patch.
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Analysis
by VulDB Data Team • 03/28/2026
The vulnerability CVE-2026-32278 represents a critical stored cross-site scripting flaw discovered in Connect-CMS, a widely used content management system that has been impacted across multiple version series. This security issue affects the Form Plugin component where user input is processed through file fields, creating a persistent vector for malicious script execution. The vulnerability exists within the 1.x series up to version 1.41.0 and the 2.x series up to version 2.41.0, indicating a significant attack surface that could compromise numerous installations. The flaw allows attackers to inject malicious JavaScript code into file field inputs that are subsequently stored and executed whenever the content is rendered, making it particularly dangerous due to its persistence nature.
The technical implementation of this vulnerability stems from inadequate input sanitization and output encoding within the Form Plugin's file handling mechanism. When users upload files through the form interface, the system fails to properly validate or escape special characters in the file metadata or names, allowing malicious payloads to be stored in the database. This stored data is then retrieved and displayed without proper sanitization, creating the conditions for XSS exploitation. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic case of insufficient data validation in web forms. The attack vector is particularly concerning as it requires minimal user interaction beyond normal form submission processes, making it suitable for automated exploitation.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with potential access to user sessions, data exfiltration capabilities, and server-side privilege escalation opportunities. An attacker who successfully exploits this vulnerability could steal cookies, hijack user sessions, redirect users to malicious sites, or even gain administrative access if the affected user has elevated privileges. The persistence of stored XSS makes this vulnerability particularly dangerous for long-term compromise, as the malicious scripts remain active until the database entries are manually removed or the system is patched. This type of vulnerability directly maps to ATT&CK technique T1566.001 for initial access through malicious file uploads and T1059.001 for command and control through script execution.
Organizations utilizing Connect-CMS versions affected by CVE-2026-32278 should immediately implement mitigation strategies including comprehensive input validation, output encoding, and strict file upload restrictions. The most effective immediate solution involves upgrading to patched versions 1.41.1 and 2.41.1, which contain the necessary security fixes for the Form Plugin. Additionally, administrators should implement content security policies to prevent script execution in file field contexts, conduct thorough security audits of all form inputs, and monitor system logs for suspicious file upload activities. Regular security assessments should include testing for similar vulnerabilities in other plugins and components, as this type of flaw often indicates broader input validation weaknesses within the application architecture. The vulnerability demonstrates the critical importance of proper input sanitization and output encoding in web applications, particularly those handling user-generated content through form interfaces.