CVE-2024-56302 identifies a stored cross-site scripting (XSS) vulnerability in the ConvertCalculator plugin for WordPress, developed by jorisderuiter. This vulnerability is caused by improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be stored and executed in the context of the victim's browser. Specifically, versions up to and including 1.1.1 are affected. Stored XSS vulnerabilities are particularly dangerous because the malicious payload is saved on the server and served to all users accessing the affected page, increasing the attack surface. An attacker can exploit this flaw by injecting JavaScript code that executes when other users visit the compromised page, potentially leading to session hijacking, credential theft, defacement, or malware distribution. The vulnerability does not require authentication or user interaction beyond visiting the infected page, making it easier to exploit. Although no public exploits have been reported yet, the risk remains significant due to the widespread use of WordPress and the plugin's functionality in creating interactive calculators. The lack of a CVSS score indicates that the vulnerability is newly published and may not yet have a patch. The vulnerability was reserved on December 18, 2024, and published on January 2, 2025, by Patchstack. The absence of patch links suggests that users should monitor for updates or apply manual mitigations.

The stored XSS vulnerability in ConvertCalculator for WordPress can have severe consequences for organizations. Attackers can execute arbitrary JavaScript in the context of users visiting the affected site, leading to theft of session cookies, user credentials, or other sensitive information. This can compromise user accounts and enable further attacks such as privilege escalation or lateral movement within an organization. Additionally, attackers can deface websites or redirect users to malicious sites, damaging brand reputation and trust. For e-commerce or service-oriented websites, this can result in financial losses and regulatory penalties if customer data is exposed. The vulnerability also increases the risk of malware distribution, potentially infecting visitors' devices. Since the plugin is used on WordPress, which powers a significant portion of the web, the scope of impact is broad. The ease of exploitation without authentication or user interaction further amplifies the threat. Organizations with high-traffic websites or those handling sensitive user data are particularly at risk.

1. Monitor the official jorisderuiter ConvertCalculator plugin repository and WordPress plugin directory for security updates and apply patches immediately once available. 2. Until a patch is released, implement manual input validation and output encoding on all user-supplied data processed by the plugin, ensuring that special characters are properly escaped to prevent script injection. 3. Employ a Web Application Firewall (WAF) with rules designed to detect and block XSS payloads targeting the ConvertCalculator plugin endpoints. 4. Conduct regular security audits and penetration testing focusing on plugin inputs and outputs to identify and remediate injection points. 5. Educate site administrators and developers about the risks of stored XSS and best practices for secure coding and plugin management. 6. Consider temporarily disabling or replacing the ConvertCalculator plugin with alternative solutions that have verified security postures until the vulnerability is resolved. 7. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on the website, mitigating the impact of potential XSS attacks.