CVE-2025-66102 identifies a reflected Cross-site Scripting (XSS) vulnerability in the FV Antispam plugin developed by FolioVision, affecting all versions up to and including 2.7. The vulnerability stems from improper neutralization of input during web page generation, which allows attackers to inject malicious JavaScript code into web pages viewed by other users. This reflected XSS requires no authentication and can be triggered by enticing a user to click on a specially crafted URL or link containing malicious payloads. Upon execution, the injected script can hijack user sessions, steal cookies, manipulate page content, or perform actions on behalf of the victim, thereby compromising confidentiality, integrity, and availability of user data and site functionality. The CVSS v3.1 base score of 7.1 reflects the high impact and ease of exploitation, with an attack vector over the network, low attack complexity, no privileges required, but requiring user interaction. The vulnerability affects websites using the FV Antispam plugin, which is commonly deployed on WordPress sites to prevent spam comments and form submissions. Although no active exploits have been reported, the widespread use of WordPress and its plugins makes this a significant risk. The vulnerability was published on December 18, 2025, with no patch links currently available, indicating that users should monitor for updates from FolioVision. The scope of impact is broad due to the plugin’s popularity in various sectors, including business, education, and government websites.

For European organizations, this vulnerability poses a significant risk to web applications relying on the FV Antispam plugin. Exploitation can lead to session hijacking, unauthorized actions on behalf of users, data leakage, and potential defacement or disruption of services. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and cause operational downtime. Since the attack requires user interaction, phishing campaigns targeting employees or customers could be used to trigger the exploit. The reflected XSS can also serve as a stepping stone for more sophisticated attacks, such as delivering malware or conducting further network intrusions. Organizations with customer-facing websites or internal portals using this plugin are particularly vulnerable. The impact extends to loss of trust and potential financial penalties under European data protection laws. Additionally, the vulnerability could be leveraged to bypass security controls or inject malicious content into trusted sites, increasing the attack surface for European entities.

1. Monitor FolioVision’s official channels for the release of a security patch addressing CVE-2025-66102 and apply updates immediately upon availability. 2. In the interim, implement Web Application Firewalls (WAFs) with robust XSS filtering rules to detect and block malicious payloads targeting the plugin. 3. Conduct thorough input validation and output encoding on all user-supplied data within the web application, especially where FV Antispam processes inputs. 4. Educate users and employees about the risks of clicking on suspicious links, particularly those received via email or social media. 5. Review and restrict the use of FV Antispam plugin to only trusted and necessary sites, considering temporary deactivation if patching is delayed. 6. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected web pages. 7. Regularly audit web application logs to detect unusual requests or attempts to exploit XSS vulnerabilities. 8. Integrate vulnerability scanning into routine security assessments to identify the presence of vulnerable plugin versions across the organization’s web assets.