CVE-2025-58961 is a DOM-based Cross-site Scripting (XSS) vulnerability identified in the kamleshyadav CF7 Auto Responder Addon for WordPress, affecting versions up to and including 2.4. The vulnerability stems from improper neutralization of input during web page generation, which allows malicious actors to inject and execute arbitrary JavaScript code within the victim's browser context. This type of XSS is client-side and occurs when the web application writes data provided by the user to the Document Object Model (DOM) without proper sanitization or encoding. The vulnerability does not require authentication but does require user interaction, such as clicking a crafted link or visiting a malicious page. The CVSS v3.1 base score is 7.1 (high), reflecting network attack vector, low attack complexity, no privileges required, user interaction needed, and impacts on confidentiality, integrity, and availability (all low). While no known exploits have been reported in the wild, the vulnerability could be leveraged to steal session cookies, perform actions on behalf of users, or conduct phishing attacks. The affected product is a popular WordPress addon used to automate responses in Contact Form 7, a widely deployed form plugin. The lack of an official patch link suggests that a fix may not yet be available, emphasizing the need for immediate mitigation steps. The vulnerability was published on October 22, 2025, with the initial reservation date on September 6, 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a significant risk especially to those relying on WordPress websites with the CF7 Auto Responder Addon installed. Exploitation could lead to unauthorized script execution in users' browsers, resulting in session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. This can compromise customer data confidentiality and website integrity, potentially damaging reputation and trust. Additionally, attackers could deface websites or inject malicious content, impacting availability and user experience. Sectors such as e-commerce, government portals, healthcare, and financial services in Europe are particularly vulnerable due to the sensitive nature of data handled and regulatory requirements like GDPR. The vulnerability's network-based attack vector and low complexity mean attackers can easily exploit it remotely, increasing the likelihood of widespread attacks if unmitigated. The lack of known exploits currently provides a window for proactive defense, but the risk remains high given the popularity of the underlying WordPress ecosystem in Europe.

European organizations should immediately audit their WordPress installations to identify the presence of the kamleshyadav CF7 Auto Responder Addon version 2.4 or earlier. Until an official patch is released, organizations should consider disabling or removing the addon to eliminate exposure. Implementing strict Content Security Policy (CSP) headers can help mitigate the impact of DOM-based XSS by restricting the execution of unauthorized scripts. Input validation and output encoding should be enforced at the application level, especially for any user-supplied data rendered in the DOM. Web Application Firewalls (WAFs) with XSS detection rules can provide an additional layer of defense. Regular monitoring of website logs and user reports for suspicious activity is recommended. Organizations should subscribe to vendor and security advisories to apply patches promptly once available. Additionally, educating users about the risks of clicking untrusted links can reduce the likelihood of successful exploitation. For critical services, consider isolating or sandboxing web components to limit the scope of potential attacks.