CVE-2025-59553 is a medium-severity vulnerability classified under CWE-79, which pertains to improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). This specific vulnerability affects the Custom iFrame plugin for Elementor developed by Coderz Studio, versions up to 1.0.13. The vulnerability is DOM-based XSS, meaning that malicious scripts can be injected and executed in the victim's browser by manipulating the Document Object Model (DOM) without involving server-side code execution. The vulnerability arises because the plugin fails to properly sanitize or neutralize user-supplied input before incorporating it into the web page, allowing attackers to inject arbitrary JavaScript code. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) shows that the attack can be launched remotely over the network, requires low attack complexity, but does require the attacker to have some privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was published on September 22, 2025, with the reservation date five days earlier. Given that Elementor is a widely used WordPress page builder and Custom iFrame is a plugin that extends its functionality, this vulnerability could be leveraged to execute malicious scripts in the context of websites using this plugin, potentially leading to session hijacking, defacement, or redirection to malicious sites.

For European organizations, the impact of this DOM-based XSS vulnerability can be significant, especially for those relying on WordPress websites built with Elementor and the Custom iFrame plugin. Successful exploitation could lead to theft of user credentials, session tokens, or other sensitive information, undermining user trust and potentially violating GDPR requirements regarding data protection. Additionally, attackers could perform actions on behalf of authenticated users, leading to data manipulation or unauthorized transactions. The availability impact, while limited, could result in temporary disruption of website functionality or user experience degradation. Since many European businesses and public sector entities use WordPress for their web presence, this vulnerability could be exploited to target customers, employees, or citizens, potentially causing reputational damage and regulatory penalties. The requirement for some privileges and user interaction reduces the likelihood of mass exploitation but does not eliminate targeted attacks against high-value organizations or individuals.

1. Immediate mitigation should include updating the Custom iFrame for Elementor plugin to the latest version once a patch is released by Coderz Studio. 2. Until a patch is available, implement Web Application Firewall (WAF) rules that detect and block suspicious input patterns targeting the vulnerable plugin's parameters. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 4. Conduct a thorough audit of all WordPress plugins and themes to identify and remove or replace outdated or unsupported components. 5. Educate site administrators and users about the risks of clicking on untrusted links or interacting with suspicious content, as user interaction is required for exploitation. 6. Monitor web server and application logs for unusual activity that may indicate attempted exploitation. 7. Consider implementing input validation and output encoding at the application level if custom code interacts with the plugin or its outputs. 8. Regularly back up website data and configurations to enable quick recovery in case of compromise.