CVE-2023-36970 in CMS Made Simple
Summary
by MITRE • 07/06/2023
A Cross-site scripting (XSS) vulnerability in CMS Made Simple v2.2.17 allows remote attackers to inject arbitrary web script or HTML via the File Upload function.
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Analysis
by VulDB Data Team • 01/15/2026
The vulnerability identified as CVE-2023-36970 represents a critical cross-site scripting flaw within CMS Made Simple version 2.2.17 that exposes web applications to remote code execution risks through file upload functionalities. This vulnerability operates under the Common Weakness Enumeration framework as CWE-79, which specifically addresses Cross-Site Scripting flaws that allow attackers to inject malicious scripts into web applications viewed by other users. The flaw manifests when the CMS Made Simple platform fails to properly sanitize or validate file upload inputs, creating an avenue for malicious actors to embed crafted scripts within uploaded files that subsequently execute in the context of other users' browsers.
The technical mechanism behind this vulnerability involves the improper handling of file metadata and content during the upload process within the CMS Made Simple framework. When users upload files through the web interface, the system should validate file types, sanitize content, and properly encode any user-supplied data before storing or displaying it. However, in version 2.2.17, this validation process contains gaps that permit malicious scripts to be embedded within file names or metadata, particularly in scenarios where file upload handlers fail to properly escape or filter user input. The vulnerability specifically targets the file upload function, which typically processes various file types including images, documents, and other media, making it a prime target for exploitation.
The operational impact of this vulnerability extends beyond simple script injection, creating potential pathways for more sophisticated attacks within the web application environment. Remote attackers can leverage this vulnerability to execute malicious scripts in the context of other users' browsers, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The attack vector requires minimal privileges as the vulnerability exists within the web application's user interface, allowing attackers to exploit it without requiring direct system access or authentication. This makes the vulnerability particularly dangerous in environments where multiple users interact with the CMS, as a single compromised upload can affect numerous users within the application's scope.
Organizations utilizing CMS Made Simple v2.2.17 face significant security risks when this vulnerability remains unaddressed, as it provides attackers with persistent access points within their web applications. The vulnerability's classification under ATT&CK framework as a web application attack vector means it can be leveraged in conjunction with other techniques such as credential harvesting or privilege escalation attacks. Security teams should implement immediate mitigation strategies including updating to patched versions of CMS Made Simple, implementing input validation controls, and deploying web application firewalls to monitor and block suspicious file upload activities. Additionally, regular security assessments of web applications should include vulnerability scanning for similar XSS flaws, particularly focusing on upload handlers and user input processing functions.
The broader implications of this vulnerability highlight the critical importance of input validation and output encoding in web application security. CMS Made Simple's failure to properly sanitize file upload data demonstrates how seemingly routine functionality can become a security liability when proper security controls are not implemented. This vulnerability reinforces industry best practices that emphasize the need for defense-in-depth strategies, where multiple layers of security controls work together to prevent exploitation of individual weaknesses. Organizations should consider implementing comprehensive security measures including regular patch management, automated vulnerability scanning, and security awareness training for developers to prevent similar issues in the future. The vulnerability also underscores the importance of secure coding practices and the need for thorough security testing during the development lifecycle to identify and remediate potential XSS vulnerabilities before they can be exploited in production environments.