CVE-2025-26907 identifies a stored cross-site scripting (XSS) vulnerability in the Estatik Mortgage Calculator plugin, a tool commonly integrated into real estate websites to provide mortgage calculation functionalities. The vulnerability stems from improper neutralization of input during web page generation, meaning that user-supplied data is not adequately sanitized or encoded before being rendered in the HTML output. This flaw allows attackers to inject malicious JavaScript code that is stored persistently on the server and executed in the browsers of users who visit the affected pages. Because the malicious script runs in the context of the vulnerable website, it can steal session cookies, perform actions on behalf of authenticated users, deface the website, or redirect users to phishing or malware sites. The affected versions include all releases up to and including 2.0.12. No CVSS score has been assigned yet, and no public exploits have been reported, but the vulnerability is publicly disclosed and classified as published. The lack of authentication requirement and the stored nature of the XSS make this vulnerability particularly dangerous, as it can affect any visitor to the compromised site. The Estatik Mortgage Calculator plugin is widely used in WordPress environments, especially in real estate sectors, increasing the potential attack surface. The vulnerability highlights the importance of proper input validation, output encoding, and secure coding practices in web application development.

The primary impact of this vulnerability is on the confidentiality and integrity of user data and the affected website. Attackers can execute arbitrary scripts in users' browsers, leading to session hijacking, theft of sensitive information such as login credentials or personal data, and unauthorized actions performed on behalf of users. This can result in reputational damage, loss of customer trust, and potential legal liabilities for organizations. Additionally, attackers may deface websites or redirect users to malicious domains, causing further harm. Since the vulnerability is stored XSS, it affects all users who access the compromised pages, amplifying the scope of impact. Organizations relying on the Estatik Mortgage Calculator plugin for their real estate websites are at risk of client-side attacks that could disrupt business operations and compromise user security. The absence of known exploits in the wild currently limits immediate widespread damage, but the public disclosure increases the risk of future exploitation. The vulnerability does not affect the availability of the service directly but can indirectly cause downtime or service degradation due to incident response and remediation efforts.

Organizations should prioritize updating the Estatik Mortgage Calculator plugin to a version that addresses this vulnerability once a patch is released by the vendor. In the absence of an immediate patch, administrators can implement web application firewall (WAF) rules to detect and block common XSS attack patterns targeting the plugin. Input validation should be enforced to restrict or sanitize user inputs, especially those that are reflected or stored and rendered on web pages. Output encoding techniques, such as HTML entity encoding, should be applied to all user-supplied data before rendering it in the browser to prevent script execution. Security teams should conduct regular code reviews and penetration testing focused on input handling and output generation. Monitoring web server logs and user activity for unusual patterns or repeated injection attempts can help detect exploitation attempts early. Additionally, educating content editors and administrators about the risks of injecting untrusted content can reduce inadvertent exposure. Employing Content Security Policy (CSP) headers can also mitigate the impact by restricting the execution of unauthorized scripts. Finally, organizations should maintain an incident response plan to quickly address any detected exploitation.