CVE-2023-43360 in CMS Made Simple
Summary
by MITRE • 10/25/2023
Cross Site Scripting vulnerability in CMSmadesimple v.2.2.18 allows a local attacker to execute arbitrary code via a crafted script to the Top Directory parameter in the File Picker Menu component.
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Analysis
by VulDB Data Team • 02/06/2026
This cross site scripting vulnerability exists within CMSmadesimple version 2.2.18 and represents a critical security flaw that enables local attackers to execute arbitrary code through manipulation of the File Picker Menu component. The vulnerability specifically targets the Top Directory parameter, which serves as an entry point for malicious script injection. When a user interacts with the file picker functionality and provides a crafted script within the Top Directory parameter, the application fails to properly sanitize or validate the input before processing it. This lack of input validation creates an environment where attacker-controlled code can be executed within the context of the victim's browser session. The vulnerability stems from inadequate sanitization of user-supplied data and improper handling of file path parameters, allowing malicious actors to inject scripts that can persist and execute in the browser environment of unsuspecting users.
The technical exploitation of this vulnerability follows a typical XSS attack pattern where the attacker crafts a malicious payload targeting the File Picker Menu component. The Top Directory parameter becomes the vector for script injection, bypassing standard security controls that should normally validate and sanitize user inputs. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a reflected XSS variant where the malicious script is stored and executed from the application's file picker functionality. The attack chain typically involves an attacker first gaining access to a local system or administrative interface, then crafting a malicious script that gets processed through the vulnerable Top Directory parameter, ultimately leading to code execution in the victim's browser context.
The operational impact of this vulnerability extends beyond simple script execution to encompass potential data breaches, session hijacking, and full system compromise. Once successfully exploited, attackers can manipulate the CMSmadesimple application to perform unauthorized actions including accessing sensitive administrative functions, modifying content, stealing user credentials, or redirecting traffic to malicious sites. The local attacker requirement suggests that initial access may come through compromised administrative credentials or system-level access, but the vulnerability's design allows for escalation once the initial foothold is established. This creates a significant risk for organizations relying on CMSmadesimple for content management, as the vulnerability can be leveraged to compromise entire websites and their underlying data stores.
Organizations should immediately implement multiple layers of defense to mitigate this vulnerability. The primary mitigation involves updating CMSmadesimple to a patched version that properly validates and sanitizes the Top Directory parameter in the File Picker Menu component. Security patches should address the root cause by implementing proper input validation and output encoding mechanisms. Additionally, implementing content security policies can help prevent script execution even if the vulnerability is exploited. Network-level protections such as web application firewalls should be configured to monitor and block suspicious requests to the File Picker Menu component. Regular security audits and penetration testing should verify that the patch has been correctly applied and that no other similar vulnerabilities exist within the application's codebase. The vulnerability also highlights the importance of following secure coding practices and implementing proper input validation as outlined in the OWASP Top Ten security guidelines. Organizations should also consider implementing principle of least privilege access controls to limit the potential impact of such vulnerabilities and establish proper monitoring to detect suspicious activity in the CMSmadesimple environment.