CVE-2025-62758 is a DOM-based Cross-site Scripting (XSS) vulnerability classified under CWE-79, found in the Funnelforms Free WordPress plugin up to version 3.8. The vulnerability stems from improper neutralization of user-supplied input during web page generation, which allows malicious actors to inject and execute arbitrary JavaScript code in the context of a victim's browser. This type of XSS is particularly dangerous as it manipulates the Document Object Model (DOM) on the client side, bypassing some traditional server-side sanitization mechanisms. The vulnerability requires an attacker to have low privileges (PR:L) and user interaction (UI:R), such as tricking a user into clicking a crafted link or visiting a malicious page. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) indicates network attack vector, low attack complexity, partial privileges, and user interaction, with a scope change that can affect multiple components. The impact includes partial loss of confidentiality (e.g., theft of session tokens or sensitive data), integrity (e.g., manipulation of page content), and availability (e.g., script-based denial of service). No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed proactively. Since Funnelforms Free is widely used for creating marketing funnels and forms on WordPress sites, this vulnerability could be leveraged to target site visitors or administrators, potentially leading to broader compromise or data leakage.

For European organizations, the impact of this DOM-based XSS vulnerability can be significant, especially for those relying on Funnelforms Free to manage customer interactions, lead generation, or marketing campaigns. Exploitation could allow attackers to steal session cookies, perform actions on behalf of users, or inject malicious content that damages brand reputation. This is particularly critical for organizations handling personal data under GDPR, as data breaches could lead to regulatory penalties. Additionally, the ability to manipulate web content or disrupt availability could affect customer trust and operational continuity. Since the vulnerability requires user interaction and some privilege, targeted phishing or social engineering campaigns could be used to exploit it. The medium severity rating reflects a moderate but tangible risk, especially in sectors like e-commerce, finance, and healthcare where web presence and data protection are paramount.

European organizations should implement the following specific mitigations: 1) Immediately audit and restrict the use of Funnelforms Free plugin to trusted administrators and minimize exposure to untrusted users. 2) Apply strict input validation and output encoding on all user-supplied data within the web application, particularly in areas where Funnelforms outputs content. 3) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 4) Monitor web traffic and logs for suspicious activities indicative of XSS exploitation attempts, such as unusual URL parameters or script injections. 5) Educate users and administrators about phishing risks and the importance of not clicking on suspicious links. 6) Follow vendor channels closely for patches or updates and apply them promptly once available. 7) Consider using web application firewalls (WAFs) with rules targeting DOM-based XSS patterns to provide an additional layer of defense. 8) Review and harden user privilege assignments to limit the potential damage from compromised accounts.