CVE-2024-50502 in Cozy Blocks Plugin
Summary
by MITRE • 10/28/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CozyThemes Cozy Blocks cozy-addons allows DOM-Based XSS.This issue affects Cozy Blocks: from n/a through <= 2.0.18.
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Analysis
by VulDB Data Team • 04/06/2026
The vulnerability identified as CVE-2024-50502 represents a critical cross-site scripting flaw within the CozyThemes Cozy Blocks cozy-addons plugin, specifically impacting versions through 2.0.18. This issue manifests as an improper neutralization of input during web page generation, creating a persistent security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability falls under the category of DOM-Based XSS, which is particularly concerning because it exploits the Document Object Model directly rather than relying on server-side input processing. The flaw occurs when user-supplied input is not properly sanitized or encoded before being incorporated into dynamically generated web content, creating an attack surface where malicious payloads can be executed within the context of a victim's browser session.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the plugin's codebase. When users interact with the Cozy Blocks functionality, particularly through dynamic content generation or parameter handling, the plugin fails to adequately sanitize user-provided data before rendering it within the DOM structure. This allows attackers to craft malicious payloads that exploit the lack of proper security controls, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The vulnerability specifically affects the DOM-based execution environment, meaning that the attack vector operates entirely within the client-side browser context rather than requiring server-side exploitation, making it particularly challenging to detect and mitigate through traditional server-side security measures.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to manipulate web page content and potentially access sensitive user data. Attackers can leverage this flaw to execute malicious scripts that may access cookies, local storage, or other browser-based data, potentially leading to unauthorized access to user accounts or sensitive information. The vulnerability affects all users of the affected plugin versions, creating a widespread security risk for websites utilizing Cozy Blocks functionality. According to CWE standards, this vulnerability maps to CWE-79 which specifically addresses Cross-site Scripting flaws, while the ATT&CK framework would categorize this under T1531 - Account Access Removal and T1059.001 - Command and Scripting Interpreter, as attackers could potentially use this vulnerability to establish persistent access or execute further malicious activities within the compromised environment.
Organizations and users affected by this vulnerability should immediately implement mitigation strategies including updating to the latest available version of the Cozy Blocks plugin, which should contain proper input sanitization and output encoding mechanisms. The recommended approach involves comprehensive input validation that treats all user-supplied data as potentially malicious, combined with proper output encoding techniques that ensure any dynamic content is rendered safely within the browser environment. Security teams should also implement Content Security Policy headers to limit the execution of unauthorized scripts and monitor for suspicious activity patterns that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within other plugins or components of the web application ecosystem, as this type of vulnerability often indicates broader security weaknesses in the overall system architecture.