CVE-2025-3704 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the DBAR Productions Volunteer Sign Up Sheets WordPress plugin. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and store arbitrary scripts within the application. When other users or administrators view the affected pages, the malicious scripts execute in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim's privileges. The vulnerability affects versions prior to 5.5.5 of the plugin. Exploitation requires an authenticated user with higher privileges (as indicated by the CVSS vector PR:H) and user interaction (UI:R), which typically means the victim must visit a crafted page or interface. The vulnerability has a CVSS 3.1 base score of 5.9, indicating a medium severity level. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes low confidentiality, integrity, and availability losses, reflecting the limited but non-negligible damage potential. The vendor has released a patch available exclusively on GitHub due to deployment issues with the WordPress.org repository, which means users must manually update the plugin to mitigate the risk. No known exploits are currently reported in the wild, but the vulnerability's nature and medium severity warrant prompt attention.

For European organizations using the DBAR Productions Volunteer Sign Up Sheets plugin, this vulnerability poses a risk primarily to websites managing volunteer coordination and sign-up processes. Exploitation could lead to unauthorized script execution in the context of authenticated users, potentially compromising user sessions, stealing sensitive information, or performing unauthorized actions on behalf of legitimate users. This could damage organizational reputation, lead to data breaches involving personal volunteer information, and disrupt volunteer management operations. Given the requirement for authenticated access and user interaction, the threat is somewhat mitigated but remains significant in environments where multiple users have elevated privileges or where social engineering could be employed. Organizations relying on this plugin for critical community engagement or event management may face operational disruptions and trust erosion if exploited.

European organizations should immediately verify if they use the DBAR Productions Volunteer Sign Up Sheets plugin and identify the version in use. If running a version prior to 5.5.5, they must manually apply the patch available on the official GitHub repository (https://github.com/dbarproductions/pta-volunteer-sign-up-sheets) since the update is not yet available via the WordPress.org repository. Additionally, organizations should restrict plugin access to trusted users only, enforce strong authentication mechanisms, and monitor user activity for suspicious behavior. Implementing Content Security Policy (CSP) headers can help mitigate the impact of XSS by restricting script execution sources. Regular security audits and user training to recognize phishing or social engineering attempts can reduce the risk of exploitation. Finally, organizations should maintain regular backups and have an incident response plan tailored to web application attacks.