CVE-2025-3615 is a stored cross-site scripting (XSS) vulnerability identified in the Fluent Forms plugin for WordPress, a popular tool for creating customizable contact forms, surveys, quizzes, and conversational forms. The vulnerability exists in all versions up to and including 6.0.2 due to insufficient sanitization of user input and inadequate output escaping in the form-submission.js script. This flaw allows authenticated attackers with Contributor-level privileges or higher to inject arbitrary JavaScript code into form submissions. Because the injected scripts are stored, they execute every time a user accesses the compromised page, potentially affecting site administrators, editors, and visitors. The vulnerability leverages CWE-79, which involves improper neutralization of input during web page generation. Exploitation does not require user interaction but does require authentication with at least Contributor-level access, which is a moderately low barrier in many WordPress environments. The CVSS 3.1 score of 6.4 reflects a medium severity, with network attack vector, low attack complexity, and privileges required. The scope is changed (S:C) because the vulnerability can affect other users beyond the attacker. Although no known exploits are currently reported in the wild, the widespread use of WordPress and Fluent Forms increases the risk of future exploitation. The vulnerability can lead to confidentiality and integrity impacts, such as session hijacking, defacement, or unauthorized actions performed in the context of affected users.

The impact of CVE-2025-3615 on organizations worldwide can be significant, especially for those relying on WordPress sites with the Fluent Forms plugin installed. Successful exploitation allows attackers to execute arbitrary scripts in the context of other users, potentially leading to session hijacking, theft of sensitive information, unauthorized actions, or website defacement. This can damage organizational reputation, lead to data breaches, and compromise user trust. Since Contributor-level access is sufficient for exploitation, insider threats or compromised low-privilege accounts pose a risk. The vulnerability affects the confidentiality and integrity of data but does not directly impact availability. Organizations with high-traffic websites, e-commerce platforms, or those handling sensitive user data are at higher risk. The medium severity score suggests a moderate but actionable threat that should be addressed promptly to prevent escalation or chained attacks.

To mitigate CVE-2025-3615, organizations should: 1) Immediately update the Fluent Forms plugin to a patched version once available, as no patch links are currently provided, monitoring vendor advisories closely. 2) Restrict Contributor-level and higher privileges to trusted users only, minimizing the risk of malicious script injection. 3) Implement a Web Application Firewall (WAF) with rules to detect and block common XSS payloads targeting form inputs and stored content. 4) Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected pages. 5) Regularly audit and sanitize existing form submissions and stored content to detect and remove any malicious scripts. 6) Monitor logs and user activity for suspicious behavior indicative of exploitation attempts. 7) Educate site administrators and content contributors about the risks of XSS and safe content handling practices. 8) Consider disabling or restricting the use of the vulnerable plugin if immediate patching is not feasible, or isolate it in a staging environment until fixed.